Rheem RTG2-42 Troubleshooting Manual page 29

Does the
Solenoid Valve
#1 have a
voltage?
Yes
Does the
Solenoid Valve
#2 have a
voltage?
Yes
Does the
Solenoid Valve
#3 have a
voltage?
Yes
Does the
P.G.F.R. valve
have a voltage?
Yes
No
Measure the voltage of connector K
between Black and White wires:
90 to 120 VDC
No
Measure the voltage of connector K
between Black and Red wires:
90 to 120 VDC
No
Measure the voltage of connector K
between Black and Blue wires:
90 to 120 VDC
No
Measure the voltage of connector R
between Black#2 and Red#1 wires:
1.5 to 14 VDC
28
SVC 810 Tankless Troubleshooting Manual
Replace Printed Circuit Board
Replace Printed Circuit Board
Replace Printed Circuit Board
Replace Printed Circuit Board