Ravenheat Runaway Heating / Control Fault

Furnace runs continuously and overheats the property, even when thermostat is turned down.

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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

Stuck relay on PCB, Room thermostat stuck closed, Incorrect wiring bypassing controls, Faulty zone valve end switch

How to Fix / Troubleshooting

Safety: Overheating can damage the system and cause discomfort. Turn off the furnace at the fused spur if it will not stop.

User checks:

  • Turn the room thermostat down to minimum or off and observe if the furnace stops.
  • Check any external programmer is not set to constant ON.

Technician checks:

  • Test room thermostat operation and replace if contacts are stuck.
  • Inspect wiring for unauthorised links across control terminals.
  • Check PCB relays for sticking and replace PCB if necessary.
  • Verify zone valve end switches are not permanently calling for heat.
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Repair Difficulty

Medium 3/5

Required Part

Room Thermostat
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