E0 • Mitsubishi Electric
Fault code E0 Mitsubishi Electric: causes, diagnosis and solution
Fault code E0 indicates a signal transmission or reception anomaly between the remote controller(s) and the interface unit/flow temperature controller (FTC) of the outdoor unit, specifically when communication fails for 3 minutes for the main controller or 2 minutes for a secondary controller.
Proof status : Manufacturer reference needed for the exact range
Source: Mitsubishi Electric documentation (service manual – according to product reference)
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Founder of AskMarcel.app. Sheets are written from manufacturer documentation; the reference is shown when it has been verified.
In brief
Fault code E0 on Mitsubishi Electric means: Fault code E0 indicates a signal transmission or reception anomaly between the remote controller(s) and the interface unit/flow temperature controller (FTC) of the outdoor unit, specifically when communication fails for 3 minutes for the main controller or 2 minutes for a secondary controller. Most common cause: The main cause is a communication failure due to a faulty connection, incorrect wiring, excessive cable length (max 500m), electromagnetic interference (noise), or the absence of a main controller configuration when multiple remote controllers are connected. First action: Inspect the transmission cable and interface unit/FTC connections for any disconnection or looseness.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).
According to Mitsubishi Electric documentation, fault code E0 is triggered if the main controller does not receive data for 3 minutes or if a secondary controller is deprived of it for 2 minutes.
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What does fault code E0 on Mitsubishi Electric mean?
Fault code E0 indicates a signal transmission or reception anomaly between the remote controller(s) and the interface unit/flow temperature controller (FTC) of the outdoor unit, specifically when communication fails for 3 minutes for the main controller or 2 minutes for a secondary controller.
The main cause is a communication failure due to a faulty connection, incorrect wiring, excessive cable length (max 500m), electromagnetic interference (noise), or the absence of a main controller configuration when multiple remote controllers are connected.
Symptoms
- Display of fault code E0 on the remote controller(s).
- Illumination of LEDs (LED1, LED2) on the outdoor unit board indicating fault code E4.
- Loss of communication between the main controller and the interface unit/FTC.
- Loss of communication between secondary controllers and the network.
- Display of associated codes such as 'RC NG', 'RC E3' or 'ERC 00-66' during diagnosis.
Diagnosis
1. Physical and wiring check
- Inspect the transmission cable and interface unit/FTC connections for any disconnection or looseness.
- Check the total cable length (max 500m) and ensure no triple cable is used.
- Confirm that at least one remote controller is configured as 'main'.
2. Remote controller diagnosis
- Perform remote controller diagnosis: if 'RC OK' is displayed, the problem lies elsewhere.
- If 'RC NG' is displayed, replace the faulty remote controller.
- If 'RC E3' or 'ERC 00-66' is displayed, suspect noise on the transmission cable.
Repair and return to service — Mitsubishi Electric fault E0
After checking and correcting the physical connections and remote controller configuration, restart the unit. If the problem persists and the diagnosis indicates 'RC OK', replace the interface unit/FTC board. If the diagnosis indicates 'RC NG', replace the affected remote controller.
When should you call an F-Gas engineer?
Contact an F-Gas registered engineer if the fault returns after basic checks, involves refrigerant charging, or requires PCB or compressor replacement on Mitsubishi Electric.
Affected models
- Ecodan ATW Databook (PUZ WZ)
- Ecodan ATW PUHZ W50VHA BS
- Ecodan PUHZ SW50VKA BS
- Ecodan PUHZ HW140VHA2 BS
Field context
This code appears during a loss of bidirectional communication in the remote controller network. It is common after wiring manipulation, network extension beyond specified limits, or in the case of noise on the line. The installer must check the 'Main/Sub' configuration and
Frequently asked questions
What are the exact non-reception times that trigger fault code E0?
Fault code E0 is displayed if the main controller receives no transmission from the interface unit for 3 minutes, or if a secondary controller receives no signal for 2 minutes. These times vary depending on the controller's role in the network.
How do I diagnose whether the fault is from the remote controller or the FTC board?
After checking the wiring and configuration, perform a diagnosis. If the display shows 'RC OK', the remote controllers are healthy; replace the FTC board if the problem persists. If the display shows 'RC NG', replace the affected remote controller.
What are the wiring constraints to avoid this code?
The total cable length must not exceed 500 metres. It is imperative not to use more than two cables in parallel (cable x 3 or more). Additionally, ensure at least one remote controller is configured as 'main' if multiple units are connected.
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