Mitsubishi Electric M Series Installation Manual page 105

FAILURE MODE RECALL M SERIES
Check the power supply
Serial signal from outdoor unit.
Refer to Service Manual:
"How to check miss wiring and serial
signal error"
Issues of abnormal dew
condensation, check the pipes.
- MULTISPLIT
THE CAUSE OF THE
ABNORMALITY CANNOT
BE FOUND BECAUSE
IT IS NOT RECUR
Both the
Check the outdoor unit
LEDs are
POWER LAMP
OFF
Unit does not operate in Cool or
Heat mode.
Refer to Service Manual:
"Check of R.V. Coil"
In Heat Mode, the indoor unit does
not heat the room. Refer to Service
Manual: "How to check inverter/
compressor", Check pipes.
At least one
fo the LEDs
BLINKS
Both the
LEDs are
ON
MITSUBISHI ELECTRIC / DIAGNOSTIC
Check the table of the outdoor unit
FAILURE MODE RECALL
function.
Frost or Overheat of turned off
indoor unit heat exchanger.Refer to
Service Manual: "Check LEV"
In Cool Mode, the indoor unit does
not cool the room. Refer to Service
Manual: "How to check inverter/
compressor", Check the pipes
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