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