Applicable Systems
Greenstar GB162
Symptoms
The boiler reports a gas valve fault. The main gas control valve is not operating correctly.
Possible Causes
- Gas valve coil failure or open circuit
- Valve seat contaminated causing leakage or blockage
- Gas valve modulator fault
Troubleshooting Steps
- Step 1: Test the gas valve coil for continuity
Coil shows correct resistance - Step 2: Inspect the valve seat for contamination
Seat is clean and seals correctly - Step 3: Verify the modulator operation
Modulator controls gas flow correctly
How to Reset
To reset: Repair or replace the gas valve, then clear the alarm.
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Source: Worcester Bosch Boiler Manual, Worcester Bosch Group
Category: Home Boiler
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