E1 332
Worcester Bosch
Bus Communication Error (e.g., with Worcester Bosch Wave or EasyControl)
Boiler shows E1 332, often associated with communication issues with external controls.
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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
Faulty EMS/Bosch bus wiring, Incorrect polarity on control connections, Defective external controller, PCB communication port fault
How to Fix / Troubleshooting
Safety first: Isolate power before altering control wiring.
- Check control wiring: Verify that the low-voltage bus wires are correctly connected to the designated terminals and are not shorted or reversed.
- Temporarily disconnect controller: Disconnect the external controller and fit a simple link or basic room thermostat (as per manual) to see if the boiler operates normally.
- Engineer diagnosis: A technician should test bus voltage, inspect the external controller, and replace the controller or PCB if communication cannot be restored.
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Repair Difficulty
Medium
3/5
Required Part
EMS/Bus Control PCB Interface
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