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

Installation
START
SYSTEM
PURGED
YES
WITH DOOR SWITCH CLOSED
(SET SYSTEM IN HEATING
MODE - CALL FOR HEAT)
IS 'LED' ON
NO
CHECK BREAKER AND POWER
SUPPLY
IS POWER
SUPPLY OK
YES
CHECK VOLTAGE ACROSS'L1'
AND 'L2'
VAC = 115V +/-
YES
‡ Refer to plumbing section in this manual
Hydronic Furnace Start-Up and 'LED' Troubleshooting - Flow Sensor (FS Configuration)
Figure 20:
20
NO
RETURN TO PURGE & PRIME
STEPS ‡
YES
STEADY 'LED' FLASH - NORMAL
OPERATION OR STAND-BY
MODE AWAITING
THERMOSTAT CAL L
NO
RECTIFY SUPPLY VOLTAGE
PROBLEM(S) ANDRETURN TO
START
NO
CHECK FOR LOOSE OR
BROKEN WIRE
CHECK DOOR SWITCH, IF
DEFECTIVE, REPLACE SAME
AND RETURN TO START
GO TO 24 VOLTS
TROUBLESHOOTING CHART
NO
IS 'LED' ON
Rinnai Corporation Hydronic Furnace (37AHB) Manual
NOTES:
1 Pipe system between Tankless Water Heater and Hyronic Furnace ‡
2 Leak check piping system
3 Purge and prime plumbing system
4 Perform required electrical work
5 Check system operation with power to condensing unit off (if installed)
6 Control board is sometimes refered to as 'PCB'
7 Hyronic Furnace is sometimes refered to as 'RHF'
8 Typical for all check, ensure system is in the following operating mode:
AC / SINGLE STAGE
9 For Amp loads refer to specification sheet
10 Thermostat is sometimes refered to as 'T'STAT'
YES
IS 'LED'
RAPIDLY
FLASHING
NO
INCONSISTENT RAPID FLASH (PULSATING
PUMP OPERATION)– WRONG SHUNT
POSITION - REFER TO FIG.14 HYDRONIC
FURNACE CONTROL BOARD, JUMPER
(SHUNT) POSITION'P7' TO BE IN 'FS'
CHECK SYSTEM WIRING
AGAINST WIRING DIAGRAM -
RECTIFY PROBLEM(S)
NO
YES
IS 'LED' RAPID
FLASH
CONSISTENT
YES
DOMESTIC HOT WATER
DEMAND PRESENT –SYSTEM
ON HOLD - SEARCH MODE
MODE
L1/L2 = 115V +/-
YES
NO