Rheem RTG74 User Manual

SVC 810 Tankless Troubleshooting Manual
31
Error Code 61 (RTG 66 Only)
Explanation: Combustion Fan failure. Fan motor does not work properly. At a minimum check
the following:
1. Ensure fan motor will turn freely.
2. Check if there is some volume of air from the flue outlet at the top of
the heater.
3. Check wiring harness to motor for damaged and/or loose connections.
4. Check Molex connection of the PCB.
Yes
No
The water heater seems to be normal. Tr
y
to o
p
erate a
g
ain
Does the 0y
display indicate
any remaining
flame?
Pull out the relay connection of flame rod connector (M) and
then display maintenance information [0y].
Does the 0y
display indicate
any remaining
flame?
No
Clean or re
p
lace Main Burner and Flame Rod Electrodes
Re
p
lace Printed Circuit Board
Yes
Flame Rod Status: X=not detecting flame; O=is detecting flame
0y display 00 01
Flame Rod 1(white) X O
Flame Rod 1 is the white wire at connector M and goes to the burner.
Normal flame rod status in the control panel with the burner on should
be 01 or detecting flame.
Yes
Does the Fan
Motor have
sufficient
voltage?
Measure the voltage of connector G between
Black and Red wires: 144 to 192 VDC
If you accidentally cross the BLACK and
RED wires with your multimeter leads, you
will short out the circuit board and the fan
motor.
No
Replace Printed Circuit
Board
Yes
Does the Fan
operate?
No

Rheem RTG74 Specifications

General

Brand	Rheem
Model	RTG74
Category	Water Heater
Language	English