Midea M-Thermal Series - Page 68

  M‐ThermalSplit 
20190967
Procedure

P4 


Dischargepipetemperaturesensor
connectiononoutdoorunitmainPCBis
loose
1

Yes
Ensurethetemperaturesensoris
connectedproperly
No

Backupelectricheaterwateroutlet
temperaturesensorconnection,
domestichotwatertanktemperature
sensorconnectionorwatersideheat
exchangerwateroutlettemperature
sensorconnectiononhydronicboxmain
PCBisloose
2

Yes
Ensurethetemperaturesensoris
connectedproperly
No

Temperaturesensorhasshort‐circuited
orfailed
3

Yes
Replacethesensor
No

Highpressureswitchconnectionor
pressuresensorconnectiononoutdoor
unitmainPCBisloose
4

Yes
Ensurethepressureswitchisconnected
properly
No

Pressuresensorhasshort‐circuitedor
failed
5

Yes
Replacethepressuresensor
No

Thehighpressuresideisblocked,caused
bycrushedorbentpipeorblockedEXV
4
Yes
Inspectthesystemandfixtheerror
No

Thecondenserheatexchangeispoorin
heatingmode
5

Yes
Inspectthesystemandfixtheerror
No

Thewaterflowrateisnotsufficientin
coolingmode
6

Yes
Inspectthewatersystemandfixthe
error
No

ReplaceoutdoormainPCB  

Notes: 
1. Discharge pipe temperature sensor connection is port CN8 on the outdoor unit main PCBs (labeled 11in Figure 4‐2.2in Part4, 2.3 "Main PCBs for
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