T5 Sensor Is Reading Too High Of A Flue Gas Temperature - Rinnai Q series Troubleshooting Manual

T5 Senor, if
installed
T5 sensor is reading too high of a flue gas temperature. (Adjust
parameter 84 – default 212 ⁰F) See location of T5 sensor below. If red
cap is installed, T5 sensor is not being used.
Moisture on the flue gas sensor wires or
terminals could cause a false temperature
reading.
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