ACV
Short Cycling
Frequent cycling of burner with short on/off periods, even at steady demand
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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 ACV burner for system load, Incorrect control settings (differential too small), Poor primary flow, Sensor placement issues
How to Fix / Troubleshooting
Safety: Adjust control parameters only within ACV guidelines.
- 1. Check temperature differential: In the installer menu, increase the on/off differential or anti-cycling time if available.
- 2. Improve flow: Ensure primary pump speed is adequate and all valves are open to allow good circulation.
- 3. Sensor placement: Verify that sensors are correctly installed in their pockets and not influenced by local hot spots.
- 4. Hydraulic balancing: Have a heating engineer balance the system to provide a more stable load.
Persistent short cycling can reduce efficiency and lifespan; consider system redesign if the heater is significantly oversized.
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Repair Difficulty
Medium
3/5
Required Part
Control Settings / Primary Pump
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