This is a common fault code for heaters that aren't turned on once per month and usually indicates an airlock in the system. If you haven't used your heater for a while, then there are a few troubleshooting steps you can take.
1. Disconnect the heater fuel line from the fuel tank and the heater itself, then push fresh fuel through the fuel line using a syringe.
2. It is possible that the fuel filter that is integrated into the fuel pump needs to be cleaned.
3. The fuel filter needs to be replaced. Generally, the manufacturer recommends servicing the unit annually, which also includes replacing the fuel filter.
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