Installer to check system for water leaks Auto refill on too long
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Auto water refill on Should clear, if not engineer visit
Gas valve/wiring/pcb fault Engineer visit required
Flow switch stuck closed Engineer visit required
Flow switch stuck open Engineer visit required
External sensor fault Engineer visit required
Gas valve wiring Engineer visit required
Gas supply fault Check gas is turned on, if prepayment meter check there is credit. If all ok and E133 persists – contact Engineer to visit & investigate
Overheat Check radiators are bled
System water pressure low Add water via filling loop