Vokera
Short Cycling on DHW
Water heater’s burner cycles on and off rapidly while a hot tap is open
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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 appliance for low flow, Restricted DHW flow path, Faulty modulation control, Incorrect minimum burner setting
How to Fix / Troubleshooting
Safety first: Rapid cycling can stress components but is not usually an immediate hazard. Do not attempt internal adjustments.
User checks:
- Increase the hot water flow rate slightly to see if cycling reduces.
- Avoid using very low flow at mixers; use a more open setting and mix at the tap.
Engineer steps:
- Check for restrictions in the DHW circuit (filters, partially closed valves).
- Verify correct gas valve modulation and minimum burner setting according to Vokera specifications.
- Inspect the DHW NTC sensor for stability.
Professional adjustment of combustion and modulation parameters may be required.
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Repair Difficulty
Medium
3/5
Required Part
Gas Valve Assembly
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