Rinnai 37AHB SERIES Installation, Operation And Maintenance Manual page 21

Installation
Blower System 115V Troubleshooting - Flow Sensor (FS) Configuration
Figure 21:
NO
GO TO RHF START-UP & 'LED'
TROUBLESHOOTING
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
RETURN TO START
TO ISOLATE CAUSE: ENSURE
RAPID FLASH - PUMP NOT ENERGIZED -
THAT SYSTEM IS PURGED AND
CAUSES:
ALL FAUCETS AND OTHER
1. SEARCH MODE (INSUFFICIENT FLOW);
WATER CONSUMING
2. NO POWER TO PUMP ;
EQUIPMENT IS OFF (FLOW TO
3. NO POWER TO FLOW SENSOR
RHF SHOULD BE ≥ 1 GPM)
NO
GO TO CIRCULATING PUMP
115 v TROUBLESHOOTING
YES
FAN
ENERGIZED
NO
ADJUST THERMOSTAT SET
TEMPERATURE HIGHER THAN
ROOM TEMPERATURE
FAN
ENERGIZED
YES
NO
CHECK FOR LOOSE OR BROKEN
WIRES
CHECK VOLTS ACROSS 'FAN'
CONNECTIONS ON PCB ('COOL-
HI' AND 'N4')
YES
VAC = 115V +/-
NO
PROBLEM(S) WITH 24V TO PCB
- GO TO 24V
TROUBLESHOOTING CHART
YES
RECONNECT WIRES AND
CONFIRM THAT WIRING IS AS
PER WIRING DIAGRAMS
NO
CONTACT TECH.
SUPPORT
Rinnai Corporation Hydronic Furnace (37AHB) Manual
( )
START
WITH DOOR SWITCH CLOSED
(SET SYSTEM IN HEATING
MODE; CALL FOR HEAT)
IS 'LED' ON
YES
YES
STEADY 'LED'
FLASH
NO
'LED' FLASH
CODE
YES
STEADY 'LED'
FLASH
YES
YES
FAN AMP DRAW
NORMAL
NO
CHECK CAPACITOR; IF
DEFECTIVE, REPLACE
COMPONENT AND RE-CHECK
AMP DRAW
YES
(1) RECTIFY WIRING PROBLEM(S)
NO
FAN MOTOR
ENERGIZED
REPLACE FAULTY COMPONENT(S)
CONNECT FAN DIRECTLY TO
115 VAC POWER SUPPLY
CHECK CAPACITOR; IF
NO
DEFECTIVE REPLACE
COMPONENT AND RE-CHECK
AMP DRAW
CHECK FAN
MOTOR; IF
NO
DEFECTIVE
FAN AMP DRAW
REPLACE
NORMAL
COMPONENT
AND RE-CHECK
AMP DRAW
RETURN TO START
SYSTEM
WORKING
YES
YES
FINISH
NORMAL OPERATION OR
STAND-BY MODE (AWAITING
THERMOSTAT CALL)
YES
FAN AMP DRAW
NORMAL
NO
CHECK FAN MOTOR; IF
DEFECTIVE REPLACE
COMPONENT
(2) CHECK MOTOR AND
CAPACITOR; IF DEFECTIVE,
RETURN TO START
FAN AMP DRAW
NORMAL
YES
SYSTEM
WORKING
NO
21