Ideal Central Heating Zone Control Issue

Thermostat shows 'Heating On' but radiators remain cold while hot water works

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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 CH zone valve, CH valve not wired to Ideal thermostat output, Airlock or closed radiator valves (hydraulic issue), Misconfigured zone assignment in app

How to Fix / Troubleshooting

Safety first: Isolate power before touching zone valves or wiring.

Steps:

  • 1. Check radiator valves: Ensure TRVs and lockshield valves are open on several radiators.
  • 2. Test CH zone valve: Locate the CH motorised valve. When the thermostat calls for heat, feel if the valve body warms and the pipe after it gets hot. Manually move the lever to 'Manual/Open' to see if radiators heat.
  • 3. Verify wiring: Confirm the thermostat CH output is wired to the CH valve or boiler CH input, not just to HW circuits.
  • 4. App zone configuration: In the Ideal app, ensure the thermostat is assigned to the correct heating zone and that zone is enabled.
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Repair Difficulty

Medium 3/5

Required Part

Central Heating Zone Valve (controlled by Ideal Thermostat)
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