P0
Junkers
Gas Pressure / Gas Supply Fault
P0 displayed, furnace in lockout, no heating or hot water
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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
Insufficient gas inlet pressure, Blocked gas filter in Junkers gas valve, Incorrect gas type setting, Regulator fault upstream
How to Fix / Troubleshooting
Safety first: Do not attempt to adjust gas regulators yourself. Only licensed gas technicians should work on gas supply.
- 1. Check gas availability: Confirm that other gas appliances work. If not, contact your gas supplier.
- 2. Verify gas cock position: Ensure the gas isolation valve at the furnace is fully open.
- 3. Technician gas test: A qualified technician should measure inlet gas pressure at the Junkers gas valve test point and compare with specifications. If low, the issue may be with the supply or regulator.
- 4. Gas filter and valve: The technician should inspect and clean the gas filter inside the valve if fitted, and verify correct operation of the valve.
- 5. Configuration: Ensure the furnace is configured for the correct gas type (natural gas or LPG) according to Junkers instructions.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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