Hoval
Short cycling
Furnace frequently cycles on and off with short run times
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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
Oversized Hoval furnace for system, Incorrect control settings (too narrow differential), Blocked or closed thermostatic valves, Poor system water volume
How to Fix / Troubleshooting
Safety: System components may be hot; use caution.
- Check thermostats: Ensure room thermostats and TRVs are not all set very low while the furnace setpoint is high.
- Adjust settings: In the Hoval controller, increase the temperature differential or minimum burner run time if available.
- Open circuits: Make sure at least one heating circuit or bypass is always open to allow flow.
- Consult installer: Persistent short cycling may require system modifications (buffer tank, control changes).
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Repair Difficulty
Medium
3/5
Required Part
Hoval Controller Module
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