Rheem TRITON GHE80SS Service Training Manual page 39

TROUBLESHOOTING ERROR CODES
Error A022 Upper Tank Sensor is Open
This error code means the water temperature probe is not connected or the water temperature thermistor is
damaged. Things to check:
• Make sure the Molex connector to the
ECO/temperature probe is connected, har-
ness is properly oriented so locking tab on
Molex locks into ECO/temp probe, and
wires are secure.
• Make sure the Molex at location P2 on the
ignition control board is securely connect-
ed and oriented so the locking tab on the
Molex locks onto the connector on the
control board. Confirm all wires are secure
in the harness, and the pins on the control
board are not bent/broken.
• Disconnect wiring from the ECO/Tem-
perature probe. Check the ohms reading
across pins 1 & 2, as shown in the photo to
the right, and compare to the chart below.
Temp °C Temp °F
0 32
5 41
10 50
15 59
20 68
25 77
30 86
A023 Upper Tank Temp Too Hot
This alarm means the ignition control board is sensing the upper
tank temperature has exceeded 205°F. The programming on the
control board should not allow this to happen and therefore we
are dealing with either a bad ignition board, ECO/Temp Probe, or
wiring harness.
• Refer to troubleshooting steps for A022.
Resistance
Temp °C
(Ω)
36100 35
28590 40
22790 45
18290 50
14770 55
12000 60
9805 65
39
The resistance should show about what
the water temperature is inside the tank.
Replace the temp probe if the circuit is
open or the resistance value does not rep-
resent the water temperature in the tank.
• If ECO/Temp probe reading is correct,
reconnect wiring to ECO/Temp probe. Dis-
connect the P2 wiring harness from the
control board and measure the ohms read-
ing across the blue wires in the harness.
You should get about the same ohms
reading as you had on the probe. If the
reading is not close or circuit reads open,
replace the wiring harness.
• If all readings are correct at probe and
harness, replace the ignition control board.
Resistance
Temp °F
(Ω)
95 8055
104 6653
113 5524
122 4609
131 3863
140 3253
149 2752
Rheem TRITON
Service Manual
Resistance
Temp °C Temp °F
70 158
75 167
80 176
85 185
90 194
95 203
100 212
TM
(Ω)
2337
1994
1707
1467
1266
1096
952