15

Immergas Gas Valve Control Fault

Display shows 15, furnace does not start, may be related to gas valve control

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.

Possible Causes

Gas valve coil open or shorted, Wiring fault between PCB and gas valve, Faulty gas valve driver on PCB

How to Fix / Troubleshooting

Critical safety: Gas valve work must only be performed by a licensed gas technician. Do not attempt to open or adjust the gas valve yourself.

User checks:

1. Reset and observe: Reset the boiler and listen for the click of the gas valve during ignition. If there is no click and code 15 appears, a control fault is likely.
2. Verify gas supply: Ensure the gas cock is open and other gas appliances work.

Technician actions:

Measure coil resistance and insulation of the gas valve.
Check supply voltage from the PCB during ignition.
Replace the gas valve or main PCB as indicated by test results.

Repair Difficulty

Professional Required 5/5

Required Part

Gas Valve Assembly

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