Display shows sensor short-circuit error; temperature reading is extremely high.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Disconnect power before testing sensors.
Step-by-step checks:
- Identify which sensor: Use the diagnostic menu or manual to determine whether the DHW, flow, return, or flue sensor is implicated.
- Inspect wiring: Look for crushed or pinched cables, especially where they pass through metal panels.
- Dry connectors: If there is condensation, gently dry the connectors and surrounding area.
When to call a professional: Sensor resistance testing and replacement should be performed by a technician if you are not experienced with electrical measurements.
Repair Difficulty
Required Part
We may earn a commission from links on this page.