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Midea R32 M thermal Arctic Mono fault E7

Balance tank sensor Tbt1 error

Heat pump

What it means

Balance tank sensor Tbt1 error (serial number 8). Displayed on user interface and refrigerant system main PCB.

Likely causes

  1. Sensor Tbt1 disconnected, sensor malfunction, wiring break, PCB connection issue
  2. Temperature sensor not connected properly or has malfunctioned. Damaged hydronic system main PCB.
  3. Temperature sensor connection on hydronic system main PCB is loose
  4. Temperature sensor has short-circuited
  5. Temperature sensor has failed
  6. Damaged hydronic system main PCB
  7. Sensor Tbt1 fault
  8. Sensor wiring fault
  9. Hydronic box main PCB fault
  10. Damaged cables between hydronic box main PCB and outdoor unit main PCB
  11. Outdoor unit main PCB fault
  12. Incorrect or abnormal input power supply (N or L)

Where to start

  1. Check sensor Tbt1 connection, measure sensor resistance, verify wiring continuity, test sensor response
  2. Identify sensor type based on fault code
  3. Locate corresponding port on refrigerant system main PCB for that model

The full answer, free

  • 20 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 66), 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 R32 M thermal Arctic Mono. Check the model on the data plate before you order parts.

Other Midea R32 M thermal Arctic Mono fault codes