37
e
A4
REPLACE
CONTROL BOARD
CHECK DHW
NTC SENSOR OR
CONNECTION
FAULT CODE
SHOWING 03
DO
THE BOILER
FLOW SWITCH
OPERATE
DOES THE
FLOW SWITCH PIN
OPERATE
CHECK AND/OR REPLACE THE
DIAPHRAGM.
CHECK THE CORRECT WATER DP
CHECK THE WATER CIRCUIT.
CHECK IF THE PUMP IS ON 3a SPEED
A3
CHECK THE
WIRING AND/OR
THE CONTROL
BOARD
CHECK/
REPLACE THE
BOILER FLOW
SWITCH
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
FAULT CODE
SHOWING 04
FAULT CODE
SHOWING 06
FAULT CODE
SHOWING 07
FAULT CODE
SHOWING 08
CHECK FLOW
NTC SENSOR OR
CONNECTION
CHECK COMBUSTION
AND BURNER
THERMISTOR OR
CONNECTION
YES
NO
FAULT CODE
SHOWING d1
YES
CHECK CONDENSATE
LEVEL, SENSOR
OR WIRING
NO
FAULT CODE
SHOWING d2
YES
CHECK CONDENSATE
SENSOR
AND WIRING
REPLACE
CONTROL BOARD
NO