Ferroli
Cross‑Wiring / Zone Valve Backfeed
Thermostat fails to control multiple heating zones correctly; some zones heat when they should be off.
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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
Shared neutrals between zone valves causing backfeed, Incorrect wiring of Ferroli zone controller outputs, Misassigned zones in thermostat configuration, Faulty diodes or isolation on zone board
How to Fix / Troubleshooting
Safety first: Zone valves and controllers may carry mains voltage. Isolate power before working.
- Verify wiring diagram:
- Compare actual wiring to the Ferroli zone controller schematic.
- Separate neutrals:
- Ensure each zone valve is wired according to the manufacturer's instructions with proper common/neutral connections.
- Test zones individually:
- Call for heat in one zone at a time and observe which valves open.
- Correct any miswired outputs.
- Reconfigure zones in thermostat:
- Assign each room thermostat or zone to the correct output channel in the Ferroli system menu.
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Repair Difficulty
Hard
4/5
Required Part
Ferroli Zone Control Module
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