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Midea M-Thermal Arctic HT R290 Mono fault C2

IBH (internal backup heater) related fault

Heat pump

What it means

C2 error occurs on units fitted with IBH (internal backup heater). The fault is associated with the IBH PCB and requires confirmation of repair before restoring the code.

Likely causes

  1. Relay poor contact
  2. Relay deformation
  3. Relay aging
  4. External overcurrent
  5. Over high ambient temperature
  6. IBH PCB fault

Where to start

  1. Navigate wired controller operation parameter menu to review live values #00 1 through #00 61
  2. Note that unavailable parameters for the given configuration will not display
  3. Power off the unit and remove IBH PCB

The full answer, free

  • 6 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 60), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Midea manual for the M-Thermal Arctic HT R290 Mono. Check the model on the data plate before you order parts.

Other Midea M-Thermal Arctic HT R290 Mono fault codes