8.0 Troubleshooting
This section includes various conditions as well as possible solutions. Often, a problem can be
identified and solved through basic checks: confirming the electrical power supply, gas flow and
resetting the thermostat control. Below are some common troubleshooting issues including fixes.
8.1 Electronic components
This section details the method for troubleshooting the non-standard electronic components on the
boiler.
8.1.1 Temperature sensors
The resistance of the temperature sensors varies inversely with temperature. To test, measure the
temperature of the sensed environment and compare with the value derived from the measurement of
the resistance (obtained by connecting a good quality test meter capable of measuring up to 5,000 kΩ
(5,000,000Ω) at the controller end of the sensor lead).
To obtain a resistance reading, remove power to the boiler. For the supply water, return water, and vent
temperature sensors, remove the wire leads by disconnecting their respective Molex connectors.
Place multi-meter probes into the sensor’s female Molex connector socket. Do not apply voltage to the
sensor as damage may result.
The supply water and vent temperature sensors each contain two separate circuits. Test each pair.
Both circuits must deliver accurate (although not necessarily identical) readings. Note that failures may
occur only within certain temperature ranges.
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