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A Factorio steam engine that appears idle is usually waiting for a demand signal, missing steam, or disconnected from the electric network—not permanently broken. Diagnose the production chain in this order: connect the engine to the correct power network, verify steam at its inlet, trace water back to the offshore pump, confirm boiler fuel, then check whether the factory is asking for more power. A power-pole diagnostic separates a genuine outage from normal throttling.
Diagnose the failure in the correct order
Work through these checks from the engine outward. Fixing a later-stage symptom before confirming the earlier stage can make a working plant look more complicated than it is.
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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →- Check the electric connection. Select or hover the steam engine. If it is not connected to an electric network, a small yellow warning triangle flashes. Place medium or small power poles so their connection areas overlap the engine network, then continue the pole line to the machines that need electricity. A physically adjacent engine is not necessarily electrically connected.
- Inspect steam at the engine. Look at the engine’s fluid connection and status. Steam must arrive through a connected pipe or directly from a boiler. If the engine has no steam, an electric connection alone cannot produce power.
- Trace water through every pipe. Hover each pipe, underground pipe and junction between the offshore pump and boilers. Confirm that water is present on both sides of every connection. A single missing underground segment or misplaced pipe can leave boilers empty while the rest of the factory appears normal.
- Verify boiler fuel. Open the boiler and confirm that coal, solid fuel or another accepted fuel is entering its burner. A boiler with water but no fuel produces no steam. Check inserter direction, chest contents and belt delivery as well as the boiler’s own fuel slot.
- Check demand before rebuilding. Engines automatically reduce output and steam consumption when the electric network does not need their full capacity. A low production number with full satisfaction is normal; it is not evidence of a broken engine.
- Open the network diagnostic. Click a power pole connected to the plant. The electric-network panel shows production, consumption and satisfaction. This reveals whether engines are absent from the network, the network is demand-limited, or generation is genuinely below the load.
How the vanilla steam chain works
The early-game chain is linear: an offshore pump supplies water, boilers burn fuel to heat that water, pipes carry steam, and steam engines convert the steam into electricity. Every link must work for the next link to show useful output.
| Component | What it does | Key value or condition |
|---|---|---|
| Offshore pump | Supplies water to the boiler line | Must have a valid shoreline position and an unobstructed pipe connection |
| Boiler | Burns fuel and turns water into steam | Produces 60 steam per second; boiler steam is 165°C |
| Steam engine | Consumes steam and generates electricity | Consumes 30 steam per second and can produce up to 900 kW |
| Pipes | Carry water and steam between machines | Every segment and underground pair must be connected to the intended fluid system |
| Power poles | Join generators to an electric network | Overlapping supply areas are required; touching graphics alone is not enough |
Because one boiler’s output matches two engines’ maximum steam demand, the standard design is two steam engines per boiler. The documented scalable vanilla capacity is one offshore pump for 200 boilers and 400 steam engines. These are capacity relationships, not a requirement that every small plant be built at full scale.
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Read the numbers before changing the layout
Each boiler can make 60 steam per second, while one engine can consume 30 steam per second when it is working at its maximum. Two engines therefore consume exactly one boiler’s maximum steam output. If you attach a third engine to that boiler, it may remain idle or share the available steam, but adding it does not increase the boiler’s production. Conversely, one engine on a boiler is a valid small setup; the unused capacity simply remains available for a later expansion.
The 900 kW figure is a ceiling, not a promise that the engine will always display 900 kW. The electric network requests only the power its machines currently need. A quiet starter base can show low engine production and still have completely satisfied consumers. Compare the current production with the network’s available production and satisfaction before adding boilers or rebuilding pipes. An unsatisfied network indicates a capacity or connectivity problem; full satisfaction with low production usually indicates normal throttling.
The pump-to-plant relationship is also a capacity limit rather than a construction rule. One offshore pump can support the documented vanilla maximum of 200 boilers and 400 steam engines. A compact plant with one pump, a few boilers and a few engines is not under-pumped simply because it uses only a fraction of that capacity. At small scales, fuel delivery, a broken pipe, or absent electrical demand is more likely to be the limiting factor.
Fix each common symptom
The engine shows a yellow warning or no network output
This indicates an electric-network problem. Follow the poles from the engine to the nearest consumer. Add a pole whose supply area overlaps the engine’s connection area, then bridge any gap to the existing factory network. If the engine is in a separate isolated network, it can spin while supplying nothing useful; joining the pole line resolves that isolation. Reopen a connected pole’s network panel and verify that the engine’s production appears there.
The boiler has water but no steam
First inspect fuel, then inspect the water path. A boiler needs both at the same time. Confirm that the offshore pump is placed in valid water, that the first pipe is attached to its outlet, and that each underground pipe entrance is paired with the correct exit. Open the boiler to see whether fuel is being consumed. If fuel remains untouched, correct the inserter’s orientation or restore belt, chest or logistic delivery. If fuel burns but the water side is empty, repair the pipe or pump connection instead.
The engine has steam but produces little power
Read the engine’s current production and performance, then click a pole on the same network. If satisfaction is full and consumption is below available production, the engine is throttling exactly as designed. Steam engines “automatically adjust their power production and steam usage based on the current demands of the electricity network,” according to the Factorio Wiki. Add machines or otherwise create legitimate demand before judging capacity. If satisfaction is not full, inspect whether some engines are disconnected, out of steam or excluded from the pole network.
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Only some engines in a row work
Split the row into two tests: fluid and electricity. Hover the pipe feeding the idle engine and check its fluid amount; a disconnected branch can starve the far end while nearby engines continue running. Then verify that each engine’s electric connection reaches the same pole network. A break in either network commonly isolates one part of a long row. Replacing the entire row is unnecessary unless inspection shows multiple damaged connections.
Power collapses after a blackout
During a blackout, powered inserters may stop feeding boilers, so the plant cannot restart itself. Give at least one boiler a restart path with a burner inserter and a stored supply of fuel. A burner inserter does not depend on the failed electric network and can keep that boiler supplied until steam power returns. Once the grid is stable, powered inserters can resume normal throughput.
Use the interface to locate the exact break
Power-pole network panel
Click a pole connected to the suspected plant. Compare the panel’s production, consumption and satisfaction values. Production that is absent means the engines are not part of that network or are receiving no usable steam. Production near the network’s available maximum with unsatisfied demand points to insufficient generation or a failed parallel plant. Full satisfaction with low production points to normal demand-based throttling.
Engine and boiler inspection
Hovering an engine exposes its fluid connection and operating state. Look for steam reaching the inlet rather than assuming a nearby pipe is connected. Opening a boiler lets you confirm fuel and observe whether it is converting water. Check both ends of a pipe run; a single disconnected tile can leave a visually continuous line dry.
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Test one engine and one boiler first. If that pair works, the fault is likely downstream in the row, pole coverage or demand distribution. If neither works, move upstream to the pump, water line and fuel supply. This local test prevents a whole-factory rebuild for a one-tile connection error.
A practical startup and restart sequence
When commissioning a new plant, start with one complete boiler-and-engine pair instead of placing a large row and troubleshooting everything at once. Place the offshore pump in valid water, attach the first water pipe, and watch the boiler input for water. Add fuel and confirm that the boiler begins converting water into 165°C steam. Connect that steam outlet directly to one engine, then place a pole that also reaches a small consumer. The pole panel should now show both production and consumption.
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Once the first pair works, duplicate the arrangement while preserving the two-engines-per-boiler relationship. After each added group, check a pole rather than waiting for a factory-wide blackout. If an expansion fails, the last working group gives you a known-good reference: compare its pipe junction, fuel inserter and pole coverage with the first idle group.
For recovery after a blackout, prioritize one boiler. Put fuel within reach of a burner inserter and make sure its steam output reaches at least one engine that belongs to the main pole network. That first engine can restore electricity for the powered inserters. A burner-inserter path is specifically valuable because a powered inserter cannot operate while the network that supplies it is down.
Build a reliable starter plant
The quick-start tutorial’s practical block uses one offshore pump, 20 boilers and 40 steam engines. Connect boiler output to the middle of each steam engine’s short side, and keep the water and steam pipe paths unambiguous. Build the plant in repeatable boiler-to-engine groups rather than one extremely long pipe run; groups make a broken branch easier to identify and expand.
- Place the offshore pump in valid water and orient its outlet toward the boiler line.
- Run the water pipe to the boiler inputs, using underground pipes where belts or walkways must cross.
- Feed each boiler with fuel from a belt, chest or inserter arrangement. Ensure inserters point into the boiler’s fuel side.
- Connect each boiler’s steam output to the engine fluid ports. Keep the intended two-engines-per-boiler relationship as the plant grows.
- Place power poles so every engine is in the same electric network as the machines being powered.
- Click a pole and verify that the network recognizes both production and consumption before adding more rows.
For expansion, add complete groups while preserving the documented pump-to-boiler capacity and the two-engine relationship. When a plant is much smaller than the pump’s capacity, the limiting factor is usually fuel delivery, pipe connectivity or demand—not pump quantity.
Common build mistakes that mimic a broken engine
- Relying on visual contact. An engine sprite can sit beside a pole or pipe without being connected. Use the engine status and pole network panel as evidence.
- Leaving one underground pipe unmatched. The entrance and exit must form the intended pair. A gap can drain an entire downstream branch while the upstream pipes still look correct.
- Checking only the boiler. A boiler may have fuel and water while the steam outlet is disconnected from the engines. Inspect the engine inlet, not just the boiler’s animation.
- Adding engines to solve low displayed output. If satisfaction is already full, extra engines will also throttle. Increase generation only when the network shows unsatisfied demand.
- Feeding boilers only with powered inserters. That arrangement works during normal operation but may fail to restart after a blackout. Keep a burner-inserter restart path for at least one boiler.
- Mixing fluids in a modded line. An engine can show a fluid in its pipe while rejecting the wrong fluid or temperature. Verify the machine’s accepted fluid whenever a mod or heat exchanger is involved.
Steam temperature and modded setups
Steam is a gas transported through pipes and accepted through a steam engine’s fluid ports. Boiler steam is 165°C in the normal vanilla setup. Steam can pass through engines and be stored in tanks. If steam temperature is below an engine’s optimum, output is lower, although the energy in that steam is not wasted.
Temperature matters mainly when mods, heat exchangers or mixed-temperature lines are involved. In a standard early-game boiler-to-engine plant, use the boiler’s 165°C steam and concentrate on connection, water, fuel and network demand. In a modded plant, check that the engine accepts the actual fluid and temperature being supplied; a pipe can contain steam while the receiving machine still rejects it or runs below its rated output.
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Choose the fix by failure point
| Observed failure point | Best first fix | Scope to inspect | Interface evidence |
|---|---|---|---|
| Electric-network connection | Extend or join power poles | One engine, one row or the whole pole network | Yellow warning, missing production in the pole panel |
| Water supply | Repair pump, pipe or underground connection | From offshore pump to affected boilers | Empty pipe window or dry boiler input |
| Fuel delivery | Restore fuel, inserter direction or belt/chest feed | Individual boiler or the fuel line | Fuel slot empty or fuel not being consumed |
| Steam routing | Reconnect boiler output and engine inlet | One branch or an entire engine row | Engine fluid amount absent or only near engines supplied |
| Insufficient generation | Add correctly connected boiler-engine groups | Entire electric network | Demand exceeds available production; satisfaction falls |
| Blackout recovery | Add a burner-inserter restart path | At least one boiler and its fuel reserve | Powered inserters stop while the grid is down |
Expansion math and layout checks
Use the ratios as a quick audit whenever you expand. Count boilers and multiply by two to estimate the number of engines that can receive their full steam supply. Count engines and divide by two to estimate the boilers needed for maximum output. Then compare the total to the offshore pump capacity. For example, 10 boilers and 20 engines preserve the standard relationship, while 10 boilers and 30 engines leave 10 engines sharing no additional boiler output.
These calculations do not override network demand. Even a perfectly balanced 20-boiler, 40-engine block will display less than its theoretical maximum when the connected factory consumes less electricity. The useful test is whether satisfaction remains full and whether production rises when a legitimate load is switched on.
Prevent the problem during expansion
- Leave visible access to boiler fuel slots and pipe junctions so inspection does not require dismantling the plant.
- Use consistent orientation: water on the boiler input side, steam toward the engine row, and poles on a predictable spacing pattern.
- After every expansion, click a pole and check production, consumption and satisfaction before diagnosing individual machines.
- Keep a fuel reserve near the restart boiler and test that the burner inserter can reach it.
- When only distant engines fail, inspect the last working pipe and pole before replacing any machines.
- When output falls but satisfaction remains full, treat the reading as demand throttling rather than a capacity failure.
What the official checklist is asking you to verify
The Factorio Wiki’s power-production checklist can be reduced to three decisive questions: “Did you connect the steam engine to the electric system?”, “Is steam able to reach all steam engines?” and “Do your pipes have water?” Answering those questions, then checking boiler fuel and network demand, identifies virtually every vanilla steam-power outage without replacing working equipment.
Frequently Asked Questions
Why is my Factorio steam engine not working even though it is next to a power pole?
Graphics do not prove an electrical connection. Check for the engine’s yellow warning and place a pole whose supply area overlaps the engine, then connect that pole line to the machines that need power. Confirm the engine appears in the connected pole’s production panel.
Why are my boilers full of water but producing no steam?
A boiler needs fuel as well as water. Inspect its fuel slot and inserter, then verify that coal, solid fuel or another accepted fuel is arriving. If fuel is burning but the water input is empty, trace the offshore-pump outlet, every pipe junction and each underground-pipe pair.
Why does my steam engine show steam but make little or no power?
Steam engines throttle to the current demand of their electric network. Full satisfaction with low production is normal. If satisfaction is below full, use the pole panel to determine whether generation is insufficient or some engines are disconnected, out of steam or on another network.
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Why do only the first few engines in my row work?
The downstream branch may lack steam or electrical coverage. Inspect the pipe feeding the first idle engine and check its fluid amount, then follow power poles to ensure every engine belongs to the same network. A single broken pipe or pole connection can isolate the far end.
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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →What is the correct boiler-to-steam-engine ratio?
One boiler produces 60 steam per second and one steam engine consumes 30 steam per second at maximum, so the standard ratio is two steam engines per boiler. The engines may still show lower output when the network does not need their full capacity.
How many boilers and engines can one offshore pump support?
The documented vanilla capacity is one offshore pump for 200 boilers and 400 steam engines. Smaller plants can use the same relationship without approaching that limit; fuel, pipes or demand are usually the practical constraints.
How do I restart steam power after a blackout?
Powered inserters may stop feeding boilers while the grid is down. Supply at least one boiler with a burner inserter and a stored fuel reserve so it can continue feeding itself. Once one engine restores electricity, powered inserters can resume normal boiler fueling.
Does steam temperature matter in a normal early-game setup?
Boilers produce 165°C steam suitable for vanilla steam engines. Temperature becomes a concern mainly with mods, heat exchangers or mixed-temperature lines. Lower-than-optimal steam can reduce output without wasting the energy in the steam.
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Fix a non-working Factorio steam engine by tracing the chain in order: power poles, steam, water, boiler fuel, then network demand. Use the pole panel and machine status windows instead of relying on appearance. Keep two engines per boiler, respect the documented one-pump capacity, and protect at least one boiler with a burner-inserter restart path so a blackout does not permanently stall the plant.
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