Bosch EasyControl
Heating Circuit Isolation or Valve Fault (Control Side)
Bosch EasyControl calls for heat but radiators remain cold while hot water still works on a combi boiler.
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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
Motorized diverter valve stuck in DHW position, Faulty zone valve actuator not opening on heating demand, Incorrect wiring between EasyControl and valve actuator, Failed relay output controlling valve
How to Fix / Troubleshooting
Safety first: Turn off power to boiler and any external valves before working on them.
- 1. Observe boiler: Check if the boiler fires when EasyControl calls for heat. If it does but radiators stay cold, suspect valves or circulation.
- 2. Check diverter/zone valves: Locate the motorized valve(s) and listen/feel for movement when heating is requested. Manually move the lever (if present) to the open position and see if radiators warm up.
- 3. Inspect wiring center: Verify that the EasyControl’s heating demand output is correctly wired to the valve actuator or relay in the wiring center.
- 4. Replace actuator: If the valve does not move or gets stuck, the actuator head may need replacement.
Professional help: Valve replacement and wiring center diagnostics are best handled by a heating engineer.
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Repair Difficulty
Hard
4/5
Required Part
Motorized diverter or zone valve actuator
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