P00012A Espar fault code

This is a common fault code for heaters that haven’t been used at least once per month, and it usually indicates an airlock in the fuel system. If your heater hasn’t been used for a while, try these troubleshooting steps:

1. Prime the fuel line: Disconnect the heater’s fuel line from both the tank and the heater, then push fresh fuel through the line using a syringe.

2. Check the fuel filter in the pump: The filter integrated into the fuel pump may need cleaning.

3. Replace the fuel filter: Fuel filters should be replaced regularly. The manufacturer generally recommends annual servicing, which includes replacing the fuel filter.