Combustion test failure Installer to check flue and terminal
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External wireless control communication Installer to reprogramme external control
Maximum gas valve current Engineer visit required
Minimum gas valve current Engineer visit required
Flame sensing problem Engineer visit required
Fan parameter out of range Engineer visit required
PCB requires calibrating Installer to recalibrate boiler
Heating return sensor fault Engineer visit required
Flue sensor fault Engineer visit required
Heating flow sensor fault Engineer visit required