Rheem 874W27NF Service Manual page 20

Error Codes (continued)
Code Fault
Gas Inlet Solenoid Valve
51
Fault
52 PGFR Valve Fault
61 Combustion Fan Failure
65 Water Volume Control Fault
66
Water By-Pass Control Fault
Gas Inlet Solenoid Valve
71
Control Fault
72 Flame Sensing Device Fault
Communication Fault with
76
Remote Control
79 Fan Motor Current Fault
80 Gas Cut-off Failure
PCB data failure. Control
82
board is not programmed.
99
Fan Motor cannot vent
Heater does not operate
No
when water is flowing
code
through unit.
No Hot water takes too long to
code arrive once hot tap opened.
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by
Check gas inlet solenoid valve wiring harness for loose or damaged
terminals.
Check PGFR valve wiring harness for loose or damaged terminals.
Ensure fan motor will turn freely. Motor will operate with a small
amount of restriction. Check wiring harness to motor for damaged
and/or loose connections.
Check water flow solenoid valve wiring harness for loose or damaged
terminals. Check for proper voltage to water flow solenoid.
Check water by-pass solenoid valve wiring harness for loose or
damaged terminals. Check for proper voltage to water by-pass
solenoid.
Check gas inlet solenoid valve wiring harness for loose or damaged
terminals. Ohm out solenoid valve.
Ensure flame rod is touching flame when unit fires. Check inside
burner chamber for any foreign material blocking flame at flame rod.
Check all wiring to flame rod for damage. Check flame rod for proper
voltage. Remove flame rod and check, clean with steel wool.
Only applicable if a remote control has been connected to
provide diagnostics during fault-finding as remotes are not to
be used as standard with this product. Check remote control
wiring for loose or damaged connections. Bypass remote control
cable by connecting remote control directly to remote control
terminals on PCB. Replace cable if found to be faulty.
Ensure fan motor will turn freely. Motor will operate with a small
amount of restriction. Check fan motor for proper voltage and for
water (condensation) damage.
Ohm out all solenoid valves. Check voltage of all flame rods.
Ensure gas type connector is fitted.
Clean Air Inlet Screen; Clear vent blockages Check for blocked heat
exchanger.
Make sure unit is connected to proper power supply and circuit
breakers are on. Clean inlet water supply filter. Ensure at least the
minimum flow rate required is present. On new installations ensure
hot and cold water lines are not crossed.
Check transfer valve, element and thermostat operation.
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
Remedy
20