Midea M-Thermal Series - Page 66

  M‐ThermalSplit 
20190965
Procedure

P3 
No

Thecondenserheatexchangeispoor
1

Yes
Inspectthesystemandfixtheerror
No

Thehighpressuresideisblocked,caused
bycrushedorbentpipeorblockedEXV
2
Yes
Inspectthesystemandfixtheerror
No

Invertermodulehasshort‐circuited
3

Yes
Replacetheinvertermodule
No

Compressorhasmalfunctioned
4

Yes
Replacethecompressor
No

ReplaceoutdoormainPCB  

Notes: 
1. Inheatingmodecheckwatersideheatexchanger,waterpiping,circulatorpumpsandwaterflowswitchfordirt/blockages.Incoolingmodecheckairside
heatexchanger,fanandairoutletsfordirt/blockages.
2. Highpressuresideblockagecausesdischargetemperaturetobehigherthannormal,dischargepressuretobehigherthannormalandsuctionpressureto
belowerthannormal.
3. Setamulti‐metertobuzzermodeandtestanytwoterminalsofPNandUVWoftheinvertermodule.Ifthebuzzersounds,theinvertermodulehas
short‐circuited.
4. Thenormalresistancesoftheinvertercompressorare0.7‐1.5ΩamongUVWandinfinitebetweeneachofUVWandground.Ifanyoftheresistances
differfromthesespecifications,thecompressorhasmalfunctioned.
 
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