E20
Toshiba
Indoor Unit Power Supply Error
Unit displays E20; may be associated with abnormal indoor unit power or fuse issues.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blown indoor PCB fuse, Faulty indoor power transformer or SMPS, Loose power input terminals, Shorted component on indoor PCB
How to Fix / Troubleshooting
Safety first: Turn off the breaker and verify no voltage is present before opening the indoor electrical box.
- Step 1 – Check power at indoor unit: Confirm that the indoor unit is receiving the correct supply voltage from the outdoor unit or mains, depending on model.
- Step 2 – Inspect PCB fuse: On the indoor PCB, locate the small glass or blade fuse. If blown, investigate for shorts before replacing with the same rating.
- Step 3 – Look for burnt components: Examine the PCB for burnt tracks, components, or a damaged transformer.
- Step 4 – Replace PCB if needed: If the fuse blows again immediately or obvious PCB damage is present, replace the indoor control PCB.
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Repair Difficulty
Hard
4/5
Required Part
Indoor Control PCB
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