Rheem 874W27NF - Page 20

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TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Error Codes (continued)
Code
Fault
Remedy
51
Gas Inlet Solenoid Valve
Fault
Check gas inlet solenoid valve wiring harness for loose or damaged
terminals.
52
PGFR Valve Fault
Check PGFR valve wiring harness for loose or damaged terminals.
61
Combustion Fan Failure
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.
65
Water Volume Control Fault
Check water flow solenoid valve wiring harness for loose or damaged
terminals. Check for proper voltage to water flow solenoid.
66
Water By-Pass Control Fault
Check water by-pass solenoid valve wiring harness for loose or
damaged terminals. Check for proper voltage to water by-pass
solenoid.
71
Gas Inlet Solenoid Valve
Control Fault
Check gas inlet solenoid valve wiring harness for loose or damaged
terminals. Ohm out solenoid valve.
72
Flame Sensing Device Fault
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.
76
Communication Fault with
Remote Control
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.
79
Fan Motor Current Fault
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.
80
Gas Cut-off Failure
Ohm out all solenoid valves. Check voltage of all flame rods.
82
PCB data failure. Control
board is not programmed.
Ensure gas type connector is fitted.
99
Fan Motor cannot vent
Clean Air Inlet Screen; Clear vent blockages Check for blocked heat
exchanger.
No
code
Heater does not operate
when water is flowing
through unit.
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.
No
code
Hot water takes too long to
arrive once hot tap opened.
Check transfer valve, element and thermostat operation.