Rheem RTG2-42 User Manual

SVC 810 Tankless Troubleshooting Manual
56
Error Code 33
Explanation: Hot Water Outlet Thermistor has malfunctioned. At a minimum check the
following if you get Error Codes 31, 32, 33, & 34:
1. Check for scale build up on the inlet filter screen. This scale build up could also happen
inside the machine. Scale build up on all thermistors will cause them to be inaccurate.
2. IF maintenance mode shows 32 degrees as the temperature, then the thermistor is not
making connection. (Possibly unplugged, possibly broken wire).
3. IF maintenance mode shows 199 degrees the thermistor has a direct short.
Error Code 34
Explanation: Explanation: Ambient Combustion Air Thermistor has malfunctioned. At a
minimum check the following:
Yes
Yes
Yes
The water heater appears to be
normal. Attempt to operate again.
Is the resistance
to the hot outlet
thermistor OK?
Measure the resistance of connector R
between Black#3 and Red#4 wires:
4k - 19 k ohms
Dis
p
la
y
maintenance information line
[
5
y]
Water Inlet Thermistor tem
p
erature.
No
Replace Hot Outlet
Thermistor
Re
p
lace Printer Circuit Boar
d
Yes
Does the
maintenance
information
indicate the hot
outlet temp?
The water heater appears to be
normal. Attempt to operate again.
Is the resistance
to the ambient
air thermistor
OK?
Measure the resistance of connector R
between Black#3 and Blue#7 wires:
6k (93
0
F) - 19 k (38
0
F) ohms
Dis
p
la
y
maintenance information line
[
2
y]
Ambient Air Thermistor tem
p
erature.
No
Replace Ambient Air
Thermistor
Re
p
lace Printer Circuit Boar
d
Does the
maintenance
information
indicate the
ambient air temp?
No

Rheem RTG2-42 Specifications

General

Brand	Rheem
Model	RTG2-42
Category	Water Heater
Language	English