Rheem RTG74 User Manual

SVC 810 Tankless Troubleshooting Manual
60
Error Code 66 (RTG66 Only)
Error Code 71
Explanation: Gas Inlet Solenoid Valve (G.I.S.V) fault. Check gas inlet solenoid valve wiring
harnesses for loose or damage terminals; and connection K to the circuit board is tight.
Error Code 72
Explanation: Flame Sensing Device fault. The Flame Probes are sensing the presence of flame
when there is not suppose to be any flame.
See and follow the same procedure as used in Error Code 51.
Measure the voltage at connector B between the White#2 and
Black#8 wires for: 8 to 16 VDC
Yes
When motor
operates, is the
voltage to the
water control
OK?
No
Re
p
lace the Printed Circuit Board
Re
p
lace the Water Control Assembl
y
Re
p
lace G.I.S.V. Valve
Is there power
to the G.I.S.V.
valve?
Yes
No
Re
p
lace the Printed Circuit Board
With the unit attempting to go to main burner, measure the voltage
at connector K between the Yellow and Black wires for:
75 to 100 VDC

Rheem RTG74 Specifications

General

Brand	Rheem
Model	RTG74
Category	Water Heater
Language	English