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Rinnai Corporation Hydronic Furnace (37AHB) Manual 21
Installation
Figure 21: Blower System 115V Troubleshooting - Flow Sensor (FS) Configuration
()
NO
STEADY 'LED'
FLASH
NO
WITH DOOR SWITCH CLOSED
(SET SYSTEM IN HEATING
MODE; CALL FOR HEAT)
START
IS 'LED' ON
RAPID FLASH - PUMP NOT ENERGIZED -
CAUSES:
1. SEARCH MODE (INSUFFICIENT FLOW);
2. NO POWER TO PUMP ;
3. NO POWER TO FLOW SENSOR
GO TO RHF START-UP & 'LED'
TROUBLESHOOTING
NO
YES
STEADY 'LED'
FLASH
'LED' FLASH
CODE
TO ISOLATE CAUSE: ENSURE
THAT SYSTEM IS PURGED AND
ALL FAUCETS AND OTHER
WATER CONSUMING
EQUIPMENT IS OFF (FLOW TO
RHF SHOULD BE ≥ 1 GPM)
YES
PULSING FLASH WITH PUMP AND FAN
ENERGIZED (associated with contactor
clicking sound) - WRONG SHUNT POSITION
FOR OPERATING MODE - REFER TO
FIG.14; CHANGE SHUNT POSITION AND
RETUR
N
T
O
START
NORMAL OPERATION OR
STAND-BY MODE (AWAITING
THERMOSTAT CALL)
YES
GO TO CIRCULATING PUMP
115 v TROUBLESHOOTING
YES
FINISH
YES
NO
CHECK FOR LOOSE OR BROKEN
WIRES
CHECK VOLTS ACROSS 'FAN'
CONNECTIONS ON PCB ('COOL-
HI' AND 'N4')
VAC = 115V +/-
NO
YES
PROBLEM(S) WITH 24V TO PCB
- GO TO 24V
TROUBLESHOOTING CHART
FAN AMP DRAW
NORMAL
NO
CHECK CAPACITOR; IF
DEFECTIVE REPLACE
COMPONENT AND RE-CHECK
AMP DRAW
YES
RETURN TO START
NO
FAN AMP DRAW
NORMAL
CHECK FAN
MOTOR; IF
DEFECTIVE
REPLACE
COMPONENT
AND RE-CHECK
AMP DRAW
NO
CONNECT FAN DIRECTLY TO
115 VAC POWER SUPPLY
FAN 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
FAN
ENERGIZED
YES
NO
CHECK CAPACITOR; IF
DEFECTIVE, REPLACE
COMPONENT AND RE-CHECK
AMP DRAW
FAN AMP DRAW
NORMAL
YES
NO
CHECK FAN MOTOR; IF
DEFECTIVE REPLACE
CO
MP
O
NENT
FAN
ENERGIZED
YES
NO
FAN AMP DRAW
NORMAL
YES
NO