11.0 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 and resetting the
thermostat control. Below are some common troubleshooting issues including fixes.
1. Preliminary Checks
a. Confirm power to the hydronic heat pump:check that the display is lit.
b. Check that the hydronic heat pump is not in a safety lockout.
c. Ensure wiring is clean and secure.
d. Confirm that the water pressure is within specifications.
2. Electronics Components Checks
a. See sections on checking the status of various control circuit components such as:
i. Temperature sensors
ii. Water flow sensor
iii. Water high limit switch
3. Symptoms, Diagnoses and Fixes
a. See sections covering diagnoses and fixes including:
i. Cycling
ii. Temperature
iii. Miscellaneous
11.1 Electronic components
This section details the method for troubleshooting the non-standard electronic components on the
hydronic heat pump.
11.1.1 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 hydronic heat pump. For the supply water and
return water 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.
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General