Mr Mitsubishi

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Check procedure:. If grouped then check unit addressing. Check whether the remote is wired to the master unit only. Description: It is a remote controller communication error. Incorrect wiring of remote. If the controller doesn’t have the correct 12 Vdc supply. Check procedure:. Check for 12 Vdc down to the controller and make sure LED 2 is lit on the FTC board. Check the SW1 sip switches on the outdoor unit are set correctly. Description: It is again a remote controller transmitting error. Remote controller incorrectly wired. The controller doesn’t have the correct 12 Vdc supply. Check procedure:. Check for 12 Vdc down to the controller and make sure LED 2 is lit on the FTC board. Check the SW1 sip switches on the outdoor unit are set correctly. Central controller: 6840. Description: This indicates the indoor to outdoor communication fault. No communication between FTC and outdoor Ecodan. Poor connection of interconnecting cables. Incorrect supply of 12-24 Vdc fluctuating voltage between S1 and S3. Check procedure:. Reset power supply first then the outdoor. Check interconnecting cables and voltage. Check indoor FTC LEDs. Power back up the indoor. Description: It is the comms failure indoor to outdoor (S2/S3). Incorrect system powered up. Check procedure:. Check the pumps wired in. Check the indoor isolator. Repower indoor, then outdoor. Central controller: 6840. Description: It is the comms failure indoor to outdoor (S2/S3). Incorrect system powered up. Check procedure. Check the pumps wired in. Check the indoor isolator. Repower indoor, then outdoor. Central controller: 6841. Description: It is the comms failure indoor to outdoor (S2/S3). Incorrect system powered up. Check procedure. Check the pumps wired in. Check the indoor isolator. Repower indoor, then outdoor. Central controller: 4108. Description: This is the error termed as 51 CM connector open circuit. Cause: Thermal relay is an open circuit. Check procedure: Check the thermal relay for disconnection, contact failure, or defective connection. Central controller: 4103. Description: This is termed reverse-phase detection. Causes are as follows:. Incorrect power supply. Two phases are wrong way round. Check procedure:. Check power supply. Try to swap 2 phases round. Central controller: 4102. Description: In this error, the L3 phase opens. The main cause is:. The power supply is not correct. Check procedure:. Check power supply. Check open circuit devices.