Bunn twf-ez service manual Diagnostics, Cause, Things To Check, Flashes

DIAGNOSTICS

Intermittent flashing of the READY indicator indicates that a fault exists. Count the number of flashes between pauses and use this chart as a guide to investigating the fault.

FLASHES	CAUSE	THINGS TO CHECK
1	Dry Plug - In Fault -	Water Pressure (Is water shut off?)
	Sheath of temperature probe dry for 10 minutes after power-up	Temperature probe wiring
		Fill valve wiring, function, & strainer
		Green wire between tank and circuit board
2	Low Tank Level Fault -	Water pressure (Is water shut off?)
	Level probe dry for 7 minutes after fill valve is energized	Shorting pin on J6 connector of control board
		not on correct set of pins (See page 7)
		Level probe wiring
		Temperature probe wiring
		Fill valve wiring, function, & strainer
3	Low Water Temperature Fault -	Tank heater wiring & function
	Sensor in tank is calling for heat for 30 minutes or more	Temperature probe wiring
4	Tank Sensor Disagreement -	Temperature probe wiring
	Level probe detects water, but dry plug-in probe dry	Level probe wiring
		Green wire between tank and circuit board
5	Temp Sensor Out-of-Range - High	Sensor not connected to circuit board
6	Temp Sensor Out-of-Range - Low	Sensor wires shorted together or to chassis

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