H07
Wiser by Drayton Boiler Interlock or Safety Lockout from Heat HubR

Heat HubR or app shows H07; boiler demand is locked out despite valid heat requests.

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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

Incorrect wiring to boiler interlock terminals, External controls (e.g., cylinder thermostat, motorized valves) not signaling correctly, Heat HubR safety logic triggered by a fault, Firmware bug in interlock handling

How to Fix / Troubleshooting

Safety: Disconnect mains power before inspecting wiring. Boiler circuits should be checked by a qualified heating engineer.

  • Check boiler status: Verify on the boiler display whether it is in lockout or fault mode. Reset the boiler if necessary following the manufacturer's instructions.
  • Inspect wiring: With the power off, confirm that the Heat HubR's boiler demand terminals are wired correctly to the boiler or wiring center, and that any interlocks (e.g., cylinder thermostat, motorized valve end switches) are correctly connected.
  • Bypass test (engineer only): A heating engineer may temporarily link the boiler demand terminals to confirm boiler operation independent of the Heat HubR.

If H07 persists and the wiring and boiler are confirmed to be in good condition, the Heat HubR may be misinterpreting safety inputs or have a PCB fault. Replacement may be required.

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Repair Difficulty

Professional Required 5/5

Required Part

Wiser Heat HubR
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