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Denise MillerJul 25, 2025
What to do if my Daikin MPS020B Heat Pump unit will not run?
- JJulian MartinJul 25, 2025
If your Daikin Heat Pump unit won't run, there are several potential causes: * A power issue: check for correct voltage at the compressor contactor in the control box, or replace blown fuses. * Thermostat calibration: try resetting the thermostat if it's set too high. * Contactor failure: check for 24 volts at the contactor coil and replace it if the contacts are open. * Transformer issue: check the wiring and replace the transformer if it's defective. * High pressure control: reset it, noting that it opens at 450 PSIG. See also High Head Pressure Remedy. * Damaged low voltage wiring: replace the thermostat wiring.
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