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008082013GW
T3 Sensor is located behind the condensate
trap on the E series boiler; this will look different
on Q and QP boilers. This is a close up of the
T3 sensor with the condensate trap removed.
When no discrepancies are found on the sensors it
may be a leakage of current coming in from an end
switch or pump relay box connected to terms 22 and
23. Install isolating relay on 22 and 23 or replace
faulty end switch / or pump relay box connected to
22 and 23 (NO VOLTAGE MUST COME INTO 22 and
- T3 flow sensor ground connection
T3 flow sensor failure or controller failure
To determine flow temperatures for T3 use the chart to the
left for proper resistance values for a set temperature.
Thermostat indirect tank failure – replace
thermostat by T3 (with cable) for indirect tank
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