Termet
Short Cycling / Oversized Boiler or Control Issue
Boiler frequently short cycles (turns on and off rapidly) during heating, with noticeable wear noises.
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Possible Causes
Boiler output set too high for system, Inadequate water volume or no bypass on Termet installation, Incorrect thermostat placement causing rapid temperature swings, Flow temperature set too high
How to Fix / Troubleshooting
User checks:
- Lower the CH flow temperature setting on the boiler.
- Ensure thermostatic radiator valves are not all closed in the area of the room thermostat.
Technician checks:
- Reduce the maximum CH output in the boiler parameters according to the property size.
- Install or adjust an automatic bypass valve if required by Termet guidelines.
- Review thermostat location and control strategy.
- Check system design for adequate water volume and radiator sizing.
Reducing short cycling improves efficiency and extends component life.
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Repair Difficulty
Easy
2/5
Required Part
Automatic Bypass Valve / Control Settings
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