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M5MSY-2010 Troubleshooting
Insuffi cient heating
Indoor/outdoor coil dirty
(clogged)
Indoor air fi lter dirty
Restriction e.g. at strainer,
capillary, fi lter dryer, etc.
Restricted
Compressor
Refrigerant
circuit
High heating
load
Air
circulation
Clean the coil
Clean the fi lter
Fan motor malfunction
Change or repair the motor
Obstruction at air inlet
/outlet of indoor / outdoor
unit
Remove the obstruction
Windows / doors wide
open
Close the windows / doors
Refrigerant short charge
or refrigerant leakage
Add refrigerant. Repair leakage if detected
Repair clogging or replace faulty components
Less or no compression
(Low running current)
Replace compressor
Satisfactory operation with temperature difference of air
intake & discharge of indoor unit 14°C to 20°C. *
( * value is for reference only )
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