E06
Immergas
DHW Control Output Fault
Thermostat shows E06 and cannot control domestic hot water (DHW) comfort functions
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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
Faulty DHW relay on thermostat, Shorted DHW valve or relay coil, Miswired DHW control terminals on boiler, Damaged tracks on thermostat PCB
How to Fix / Troubleshooting
Safety: Turn off all power before opening the thermostat or boiler terminal cover.
- Step 1 – Confirm DHW mode: Check thermostat settings to ensure DHW comfort or scheduling is enabled and correctly configured.
- Step 2 – Inspect wiring: At the boiler, verify that the DHW control terminals from the thermostat (if used) are correctly wired according to the Immergas wiring diagram.
- Step 3 – Isolate DHW load: Disconnect the DHW valve or relay coil from the thermostat output. Power up and see if E06 clears. If it does, the external DHW component is likely faulty.
- Step 4 – Test DHW component: Have a technician measure coil resistance and check for shorts to earth. Replace any defective DHW valve or relay.
- Step 5 – Replace thermostat: If E06 remains with no load connected and wiring is correct, the thermostat DHW output is damaged and the thermostat should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Immergas thermostat DHW control relay
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