Error A023 Upper Tank Temp Too Hot; Error A024 Upper Tank Sensor Shorted; Error A025 N Oblower Rpm Feedback; Error A026 Blower Expected Rpm/Actual Rpm Mismatch - Rheem TRITON Service And Training Manual

Troubleshooting Error Codes

Error A023 Upper Tank Temp Too Hot

This alarm means the ignition control board is sensing the upper tank temperature has exceeded 205
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.

Error A024 Upper Tank Sensor Shorted

The control board is detecting a short in the ECO/temperature probe or wiring.
• Refer to troubleshooting steps for A022.
Error A025 No Blower RPM Feedback
Control does not detect blower RPM. This is typically cause by a bad blower or wiring harness being disconnected.
•
Using a multimeter, check voltage to the blower from the board to ensure 120v of power to the blower.
•
If the blower is running while this error is present, confirm disconnect and reconnect both wiring harnesses from the
blower and make sure wiring harness from blower to board is secure at board. If blower continues to run with error
present, replace the blower.
•
If blower is not running, clear the alarm and see if blower comes on. If the blower does not come on, disconnect the
wiring harness with black, white, red, and blue wires from blower. With the power turned on to the unit and this
harness disconnected, the blower should run at full speed. If blower still does not come on or will only run at a very
low speed then replace the blower.
Error A026 Blower Expected RPM vs Actual RPM mismatch
Control board detects blower running at ≥300 RPM from desired RPM for > 1 minute.
• Confirm wiring harness from control board to fan is secured at both ends and all wires are secure in the Molex
connectors.
• Cycle power and clear alarm. If issue remains replace the blower.

Error A027 Flame Present Before Ignition

This error code means that a flame was detected prior to ignition or the controller was detecting flame rectification before
the gas valve was open. You can clear this error code by turning the unit off and on.
Things to check:
• Check for flame through the sight glass. If flame is present with this code, either the gas valve needs to be replaced or
gas pressure to unit is above maximum stated on rating label.
• Make sure the heater has a solid earth ground at the electrical connection box on top of
the unit; and the electrical connection to the power supply has a solid earth ground.
• Shut off the gas supply and cycle the water heater. If the error code returns, then replace the controller.
Triton Service Manual SVC1020T ; Rev 4
3 8
80 and 100 gallon chassis
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F. The programming