50
Intergas
Pump Fault / No Circulation
Boiler displays error code 50, no heating or hot water, pump not running
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Seized circulation pump, Failed pump motor, Airlocked pump, Faulty PCB pump relay
How to Fix / Troubleshooting
Warning: Pump access usually requires removing the boiler case and working on live electrical and water components. Only a qualified engineer should do this.
- Check system pressure: Ensure pressure is 1.0–1.5 bar. Very low pressure can cause pump noise and failure to circulate.
- Listen for pump: When the boiler calls for heat, you should hear a gentle hum from the pump. If it is silent or making loud grinding noises, note this for the engineer.
- Bleed radiators: Remove air from the system to reduce the chance of airlocks.
- Engineer actions: The engineer will attempt to free a seized pump, bleed the pump, test electrical supply, and replace the pump cartridge or complete pump assembly if required.
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Repair Difficulty
Hard
4/5
Required Part
Circulation Pump
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