In brief
Fault code Ed on Mitsubishi Electric Ecodan means: On the Ecodan range, fault code Ed means the FTC hydrobox control board has lost communication with the outdoor unit. Most common cause: S1/S2/S3 cable incorrectly connected, outdoor unit not powered, or software version incompatibility (if the control board has been replaced). First action: If you have just installed the system: verify that SW8 (or equivalent) is correctly set for the type of outdoor unit.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).
According to the Mitsubishi Electric Ecodan Installation Manual, fault code Ed indicates the FTC hydrobox control board has lost communication with the outdoor unit.
Ed • Mitsubishi Electric • Ecodan
Fault Code Ed Mitsubishi Ecodan: Hydrobox / Outdoor Unit Communication Error
On the Ecodan range, fault code Ed means the FTC hydrobox control board has lost communication with the outdoor unit.
Source: Mitsubishi Electric Ecodan Installation Manual
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What does fault code Ed on Mitsubishi Electric mean?
On the Ecodan range, fault code Ed means the FTC hydrobox control board has lost communication with the outdoor unit.
S1/S2/S3 cable incorrectly connected, outdoor unit not powered, or software version incompatibility (if the control board has been replaced).
Symptômes
- The system does not start
- Display shows '--' for outdoor temperature
Diagnostic
1. Check Dip Switches
- If you have just installed the system: verify that SW8 (or equivalent) is correctly set for the type of outdoor unit.
2. Continuity Test
- Check the S1/S2/S3 interconnecting cable.
How to reset fault code Ed on Mitsubishi Electric?
Check the wiring and power supply. Reset the system.
When should you call an F-Gas engineer?
Fault code Ed most often appears in heating or hot water mode, particularly on Ecodan systems. The system does not start.
Field context
Fault code Ed most often appears in heating or hot water mode, particularly on Ecodan systems. The system does not start.
Questions fréquentes
What does fault code Ed mean?
On the Ecodan range, fault code Ed means the FTC hydrobox control board has lost communication with the outdoor unit.
What is the most common cause of Ed?
S1/S2/S3 cable incorrectly connected, outdoor unit not powered, or software version incompatibility (if the control board has been replaced).
How do I diagnose Ed in the field?
Check the Dip Switches: If you have just installed the system, verify that SW8 (or equivalent) is correctly set for the type of outdoor unit.
How do I resolve fault Ed?
Check the wiring and power supply. Reset the system.
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