Troubleshooting - Rinnai 37AHB SERIES Installation, Operation And Maintenance Manual

Installation
CHECK TRANSFORMER FOR
CORRECT VOLTAGES
PRI:VAC = 115V +/-
SEC: VAC = 24V +/ -
CHECK 3 AMP
FUSE; IS FUSE
INTACT
CHECK T'STAT FOR CONTINUITY
WITH OHM METER BETWEEN
'R' AND 'W'
CHECK FOR 24 V ACROSS
'WH/FS' PINS
VAC = 24V +/-
CONTACT TECH. SUPPORT
If a condensing unit and cased coil set is used in conjunction with the Rinnai Hydronic Furnace for cooling,
refer to air conditioning manufacturer's instructions for hook-up and troubleshooting details.
24V Troubleshooting - Flow Sensor (FS) Configuration
Figure 23:
START
WITH DOOR SWITCH CLOSED
(SET SYSTEM IN HEATING
MODE -CALL FOR HEAT)
YES
IS 'LED' ON
NO
YES
NO
YES
CHECK FOR WIRING
PROBLEM(S) AND REPAIR OR
REPLACE AND RETURN TO
NO
CHECK PCB; IF DEFECTIVE
REPLACE COMPONENT AND
RETURN TO START
YES
NO
Rinnai Corporation Hydronic Furnace (37AHB) Manual
NO
(1) CHECK FOR WIRING PROBLEM(S)
(2) CHECK TRANSFORMER; IF DEFECTIVE,
REPLACE FAULTY COMPONENT
(1) CHECK FOR WIRING PROBLEM(S)
(2) CHECK FUSE; IF DEFECTIVE,
REPLACE FAULTY COMPONENT
NO
IS THERE
CONTINUITYAT
T'STAT
YES
YES
START
SYSTEM
WORKING
YES
FINISH
GO TO HYDRONIC FURNACE START UP
AND 'LED' TROUBLESHOOTING
24V BETWEEN THERMOSTAT AND PCB
ENSURE THAT T'STAT IS IN
HEATING MODE AND RECHECK
FOR CONTINUITY
IS THERE
CONTINUITYAT
T'STAT
NO
CHECK THERMOSTAT; IF
DEFECTIVE REPLACE
COMPONENT
24V BETWEEN CONDENSING UNIT AND PCB
23