Bard PH10481 Installation Instructions Manual - page 24
Manual 2100-354
Page
22
CHECKING TEMPERATURE SENSOR
CHECK OUT
1. Disconnect temperature sensor from board and from
outdoor coil.
2. Use an ohmmeter and measure the resistance of the
sensor. Also use ohmmeter to check for short or open.
3. Check resistance reading to chart of resistance; use
sensor ambient temperature. (Tolerance of part is
± 10%.)
4. If sensor resistance reads very low, then sensor is
shorted and will not allow proper operation of the heat
pump control.
5. If sensor is out of tolerance, shorted, open, or reads
very low ohms then it should be replaced.
F
R
F
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F
R
F
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3
TEMPERATURE F VS RESISTANCE R OF TEMPERATURE SENSOR