Rheem RTG2-42 User Manual

SVC 810 Tankless Troubleshooting Manual
17
52
Modulating Solenoid Valve
Fault
Check modulating gas solenoid valve wiring harness for loose or
damaged terminals.
Ohm out solenoid valve.
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.
Check venting length not to exceed max lengths and bends.
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
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, 81
Gas Cut-off Failure Ohm out all solenoid valves.
Check voltage of all flame rods.
82
PCB data failure. Control board
is not programmed.
Program PCB for proper altitude and fuel type circuit board with proper
programming chip.
90
Blocked Flue Fault Clean any blockage in heat exchanger, combustion fan, inlet filter, and
exhaust flue.
99
Fan Motor cannot vent Clean Air Inlet Screen; Clear vent blockages
Check for blocked heat exchanger
No
code
Nothing happens 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 you have at least the minimum flow rate required to fire unit.
On new installations ensure hot and cold water lines are not crossed.

Rheem RTG2-42 Specifications

General

Brand	Rheem
Model	RTG2-42
Category	Water Heater
Language	English