Rheem RTG74 - Page 48

SVC 810 Tankless Troubleshooting Manual
47
Is the resistance
of the Gas Inlet
Solenoid Valve
OK?
No
Yes
Measure the resistance of connector K
between Black and Yellow wires:
0.8 to 2.4k Ohms
Re
p
lace Gas Control Ass
y
Is the resistance
of the Solenoid
Valve #1 OK?
No
Yes
Measure the resistance of connector K
between Black and White wires:
0.8 to 2.4k Ohms
Re
p
lace Gas Cont
r
ol Ass
y
Is the resistance
of the Solenoid
Valve #2 OK?
No
Yes
Measure the resistance of connector K
between Black and Red wires:
0.8 to 2.4k Ohms
Re
p
lace Gas Control Ass
y
Is the resistance
of the Solenoid
Valve #3 OK?
No
Yes
Measure the resistance of connector K
between Black and Blue wires:
0.8 to 2.4k Ohms
Re
p
lace Gas Control Ass
y
The 2-4.2 and 5.3 units only have two stages of burner. Skip the
next step.
Does the
P.G.F.R. valve
have a voltage?
No
Yes
Measure the voltage of connector R
between Black#2 and Red#1 wires:
1.5 to 14 VDC
Re
p
lace Printed Circuit Board