DIAGNOSTICS

Intermittent flashing of the bank of temperature indicators, 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

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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29707 112801

 

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Bunn CDBCF-DV, CDBC APS-DV, CDBC-MV, CDBC-DV, CDBCF APS-MV, CDBCF APS-DV, CDBCF-MV Diagnostics, Cause Things to Check

CDBCF-MV, CDBCF APS-DV, CDBCF APS-MV, CDBC-DV, CDBC-MV specifications

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