25
Vokera
General Temperature Sensor / PCB Fault
Boiler shows 25, no heating, may indicate sensor or PCB fault
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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
Multiple NTC sensor errors, PCB temperature reading fault, Wiring harness damage, Short circuit on sensor lines
How to Fix / Troubleshooting
Safety first: Isolate power before inspecting internal wiring.
- Visual inspection: Look for signs of overheating or burning on the PCB and connectors.
- Engineer checks:
- Test all NTC sensors (flow, return, DHW) for correct resistance.
- Inspect wiring harness for chafing or shorts to earth.
- If sensors and wiring are sound, replace the PCB following Vokera procedures.
PCB replacement often requires reconfiguration or parameter setting; this should be done by a competent engineer.
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Repair Difficulty
Professional Required
5/5
Required Part
Main PCB (Control Board)
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