Rheem RTG2-42 Troubleshooting Manual page 18

Modulating Solenoid Valve
52
Fault
Combustion Fan Failure
61
Water Volume Control Fault
65
66 Water By-Pass Control Fault
71 Gas Inlet Solenoid Valve
Control Fault
72 Flame Sensing Device Fault
76 Communication Fault with
Remote Control
79 Fan Motor Current Fault
80, 81 Gas Cut-off Failure
82 PCB data failure. Control board
is not programmed.
Blocked Flue Fault
90
99 Fan Motor cannot vent
No Nothing happens when water is
code flowing through unit.
SVC 810 Tankless Troubleshooting Manual
Check modulating gas solenoid valve wiring harness for loose or
damaged terminals.
Ohm out solenoid valve.
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.
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.
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.
Program PCB for proper altitude and fuel type circuit board with proper
programming chip.
Clean any blockage in heat exchanger, combustion fan, inlet filter, and
exhaust flue.
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 you have at least the minimum flow rate required to fire unit.
On new installations ensure hot and cold water lines are not crossed.
17