Raypak 120, 85 manual Fault Codes, Cause, Alarm Type, Action

17. FAULT CODES

When the boiler detects a temporary fault condition, the appropriate code is shown flashing on the display. If/when the fault code is final, the pump will perform a 60-second post circulation and the red LED will be illuminated.

CODE	CAUSE	ALARM TYPE	ACTION
AL10	Ignition failure/not flame sensed,	Final	Reset, check appliance operation
	condense sensor activated
AL20	Limit thermostat fault, blocked flue switch,
	flue thermostat	Final	Reset, check appliance operation
AL21	External device fault (UHT/CPA)	Final	Reset, check appliance
AL26	Return temperature too high	Final	Reset, check pump, ensure there is sufficient
			flow sensor temperature). Circulation around
			heating circuit/s
AL28	Temperature differential inverted	Final	Reset, check pump, ensure there is sufficient
	(return sensor temperature higher than		circulation around heating circuit/s thermistors
	flowsensor temperature)
AL29	Flue sensor over temperature lock out	Final	Reset check appliance operation
AL34	Fan blower signal fault	Final	Reset check appliance operation, check fan
AL40	Insufficient system water pressure	Final	Check/refill system pressure, reset, check
		appliance operation
AL41	Insufficient system water pressure	Temporary	Check/refill system pressure, check appliance
			operation
AL52	Internal fault	Final	Reset, check boiler operation
AL55	Jumper tag fault	Final	Check jumper tag configuration
AL60	Jumper tag fault	Temporary	Check jumper tag configuration
AL71	Primary (flow) sensor fault	Temporary	Check primary thermistor, check wiring
AL73	Return sensor fault	Temporary	Check return thermistor, check /wiring
AL74	Variation on temperature of primary	Final	Reset, check boiler operation, check
			and/or return too high pump, ensure there is
			sufficient circulation around heating circuit/s
AL79	Flow temperature too high, or	Final	Reset, check appliance operation, check
	temperature differential between		thermistors
	primary and return too high
AL91	The main heat exchanger need to be	Advice	Call the Raypak technical service
	cleaned

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