PUMP HAS RUN DRY

Check system pressure, add water and then bleed if necessary.

HOT WATER NTC SENSOR DEFECTIVE

Check NTC sensor and connecting leads for circuit breaks and/or short circuits.

BREAK IN COMMUNICATION

Check connecting lead to programmer

KEYED PLUG NOT DETECTED

Insert keyed plug correctly, test and replace if necessary.

FAN SPEED TOO LOW

Check fan lead and connector, and fan; replace as necessary.

JUMPER 8-9 NOT CONNECTED

Connector not connected, link missing, or under floor heating limiter tripped.

CH FLOW NTC SENSOR DEFECTIVE.

Check CH flow NTC sensor and connecting lead.

SAFETY TEMPERATURE LIMITER IN CH FLOW HAS TRIPPED

Check system pressure, check safety temp. limiters, check pump operation, check fuse on pcb, bleed appliance.

FLAME NOT DETECTED

Is gas cock turned on? Check gas supply pressure, power supply, igniter electrode and lead, ionisation sensing electrode and lead, flue duct and CO2 level.

INTERNAL ERROR

Check electrical connector contacts, programmer interface module ignition leads and bus module are not loose; replace pcb or bus module if necessary.

FLAME DETECTED ALTHOUGH APPLIANCE IS SWITCHED OFF

Check electrode assembly, dry pcb. Flue clear?

FLAME DETECTED AFTER GAS SHUT OFF Check gas valve and wiring to gas valve. Clean condensation trap and check electrode assembly. Flue clear?

RESET BUTTON PRESSED BY MISTAKE

Press reset button again!

PLEASE WAIT INITIALISATION IN PROGRESS

24 Volt fuse blown, replace fuse!