TradeAssistIQHome

Mitsubishi Ecodan fault LE

Boiler operation error

Heat pump

What it means

Displayed under Heating condition. Boiler is running and THW6 detects a temperature <30ºC for consecutive 60 minutes.

Likely causes

  1. THW6 has become detached from its holder
  2. Incorrect wiring between FTC (OUT10) and the boiler
  3. Boiler fuel has run out or the system is OFF
  4. Boiler failure
  5. FTC board failure

Where to start

  1. Visually inspect THW6 location and reattach as necessary
  2. See the manual of the thermistors PAC-TH011HT-E for wiring check
  3. Check the status of the boiler

The full answer, free

  • 2 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 50), right under the answer
Ask about LE freeCreate a free account

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 Mitsubishi manual for the Ecodan. Check the model on the data plate before you order parts.

Other Mitsubishi Ecodan fault codes