Diagnostic Points On Printed Circuit Board - Rheem RTG2-42 Troubleshooting Manual

Diagnostic Points on Printed Circuit Board

Measurement Point
Connection Wire Color
I – J
U W1 – W2
BR1 – BK2
S
R3 – BK2
B4 – W6
G
R3 – B4
Y1 – B4
R W6 – BK3
R Y5 – BK3
R R4 – BK3
R B7 – BK3
R R1 – BK2
L R1 – GND
M W1 – GND
T B1 – GND
Flame Rod 1 is the white wire and goes to the right front half burner.
Flame Rod 2 is the red wire and goes to the right rear half burner.
Flame Rod 3 is the blue wire and goes to the left burner. (74 series only)
H GY2 – GY5
All models except RTG66: These are the two green wires at connector H. They are the two green wires
to the by by-pass solenoid on the water flow valve. When the cold water bypass solenoid is closed, must
be 0 volts DC. (Remote set at 118F ~ 180F). When the cold water bypass opens, voltage reads about 80
volts DC. (Remote is set to 100F~116F).
K Y1- BK5
K W2- BK5
K R3- BK5
K B4- BK5
W2 – BK8
R7 – BK8
B
GR6 – BK8
Normal Value
AC 90 – 110V
50K Ω – 500K Ω
DC 2 - 5V (pulse)
More than 1,310
pulses/minute is
nominal.
DC 11 – 17 V
DC 120 – 160 V
DC 12 - 18 V
DC 4 – 10 (Pulse)
0
68 F = @ 10.3 KΩ
0
104 F = @ 4.9 KΩ
0
104 F = @ 4.9 KΩ
0
68 F = @ 10.3 KΩ
DC 1.5 - 14 V
40 – 80Ω
AC 1 – 100 V
AC 1– 100 V
AC 1 – 100 V
AC 90 - 110 V
DC 75 - 100 V
.8 – 2.2. KΩ
DC 75 - 100 V
.8 – 2.2. KΩ
DC 75 - 100 V
.8 – 2.2. KΩ
DC 75 - 100 V
.8 – 2.2. KΩ
DC 8 – 16V
DC 8 – 16V
Less than 1V DC
(Limiter on)
DC4 – 6 V (Limiter
Off)
18
SVC 810 Tankless Troubleshooting Manual
What you are checking?
Do you have power to the control board?
Is the Over Heat Film Wrap OK?
Does the water flow sensor send a pulse?
(Only when water is flowing thru control)
Does the water flow sensor have voltage?
(Power ON; no water flow)
Does the fan motor have the proper voltage?
Does the fan motor have proper voltage?
Is the fan motor producing a regular pulse?
Is the cold water inlet thermistor working?
Is the heat exchanger thermistor working?
Is the hot water outlet thermistor working?
Is the ambient air thermistor working?
Is the P.G.F.R. valve operating?
(Proportional Gas Flow Regulating Valve)
Are the three flame rods detecting flame?
Is the igniter working properly
Is the solenoid (SV0) working?
(Primary fuel inlet to gas valve)
Is the solenoid valve (SV1) working?
(Fuel to ODS and front right burner)
Is the solenoid valve (SV2) working?
(Fuel to back right burner)
Is the solenoid valve (SV3) working?
(Fuel to left side burner)
Does the water volume control motor have
proper voltage?
Does the water volume control motor have
proper voltage?
Is the water volume control switch OK?