Worcester Bosch
Oversized Boiler / Poor System Design or Sensor Placement
Boiler frequently short cycles (turns on and off rapidly) when heating.
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Possible Causes
Boiler output too high for system, Incorrect parameter settings, Faulty or poorly placed room thermostat, Blocked or missing bypass
How to Fix / Troubleshooting
Safety first: Parameter changes should be made by a competent person following the installation manual.
Engineer actions:
- Check boiler output settings and reduce maximum CH output via parameters where possible.
- Ensure a suitable bypass valve is installed and correctly set to maintain minimum flow.
- Review placement and operation of the room thermostat; relocate or replace if it is affected by local heat sources.
- Balance radiators to improve heat distribution and reduce rapid temperature rise.
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Repair Difficulty
Easy
2/5
Required Part
Automatic Bypass Valve
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