Rinnai 37AHB SERIES Installation, Operation And Maintenance Manual page 22

Installation
STEADY 'LED' FLASH
ENERGIZED
NO
ADJUST THERMOSTAT SET
TEMPERATURE HIGHER THAN
ROOM TEMPERATURE
ENERGIZED
CHECK FOR LOOSE OR BROKEN
CHECK VOLTS ACROSS 'PUMP'
CONNECTIONS ON PCB
VAC = 115V +/-
PROBLEM(S) WITH 24V TO PCB
- GO TO 24V
TROUBLESHOOTING CHART
RECONNECT WIRES AND
CONFIRM THAT WIRING IS AS
PER WIRING DIAGRAMS
CONTACT TECH.
SUPPORT
Circulating Pump 115V Troubleshooting - Flow Sensor (FS) Configuration
Figure 22:
22
WITH DOOR SWITCH CLOSED
(SET SYSTEM IN HEATING MODE
YES
YES
PUMP
COMPONENT AND RE-CHECK
PUMP
YES
NO
WIRES
YES
CONNECT PUMP DIRECTLY TO
NO
COMPONENT AND RE-CHECK
YES
NO
Rinnai Corporation Hydronic Furnace (37AHB) Manual
START
-CALL FOR HEAT)
YES
IS 'LED' ON
NO
PUMP AMP
DRAW NORMAL
NO
CHECK CAPACITOR; IF
DEFECTIVE, REPLACE
AMP DRAW
REPLACE PUMP MOTOR AND
RETURN TO START
YES
PUMP MOTOR
ENERGIZED
115 VAC POWER SUPPLY
CHECK CAPACITOR; IF
DEFECTIVE REPLACE
AMP DRAW
NO
PUMP AMP
DRAW NORMAL
RETURN TO START
SYSTEM
WORKING
YES
FINISH
RAPID 'LED' FLASH
GO TO RFH START-UP &
'LED' TROUBLESHOOTING
YES
PUMP AMP
DRAW NORMAL
NO
(1) RECTIFY WIRING PROBLEM(S)
NO
(2) CHECK MOTOR AND
CAPACITOR; IF DEFECTIVE,
REPLACE FAULTY COMPONENT(S)
RETURN TO START
NO
PUMP AMP
DRAW NORMAL
CHECK PUMP
YES
MOTOR; IF
DEFECTIVE
REPLACE
COMPONENT
AND RE-CHECK
AMP DRAW
YES
SYSTEM
WORKING
NO
YES