McQuay MDS300B Manual de instalación descargar pdf (Pagina 7)

5 Troubleshooting

● If the followings unit malfunction occurred, please follow the below simple checking step to fix :

Symptom analysis Solution

Indoor temperature is higher (heating) or lower (cooling)

than setting temperature

Re – set up the temperature

Compressor stop and fan work

normally

When heating and defrost mode, indoor unit is just running Wait for 10minutes

Power is not on Check and connect the power

Set up the re-start function Wait or cancel timer On

Units do not work

Fuse broken in main power supply Replace the fuse

Air filter is too dirty Clean or replace the filter

Cooling or heating not enough

or too much

Return air barrier Remove the barrier

Low battery Replace the battery

Remote controller

unreadable

Wrong installation of battery Install properly

Humidity is too high Dehumidify

Condensing water in front panel

Setting temperature is too low Set up the higher indoor temperature

● If user can not fix the problem, please contact wit the local service agent for assistance, meanwhile record the malfunction code by remote

controller and indication light of units self-checking function.

Item

code

Description

Item

code

Description

Item

code

Description

System malfunction 26

Water pump(indoor drain pump) 49

Sensor broken(slaveTH5 mid coil 2#)

Sensor broken (TH1 discharge

temp.)

Indoor&outdoor

communication malfunction

Sensor broken(slaveTH6 inlet coil 3#)

Sensor broken (TH2 inlet coil 1#) 28

Outdoor master and outdoor slave

communication malfunction

Sensor broken(slaveTH7 mid coil 3#)

Sensor broken (TH3 mid coil 1#) 29

Fresh air filter clogging 52

Sensor broken(slaveTH8 ambient temp.)

Sensor broken (TH4 inlet coil 2#) 30

Digital comp overload 53

Sensor broken(slaveTH9 outlet coil)

Sensor broken (TH5 mid coil 2#) 31

Fixed comp1 overload 54

Sensor broken (slave TH10 subcool

outlet)

Sensor broken (TH6 inlet coil 3#) 32

Fixed comp2 overload 55

Sensor broken ( slave TH11 subcool

suction)

Sensor broken (TH7 mid coil 3#) 33

Fixed comp3 overload 56

Sensor broken(slaveTH12 suction)

Sensor broken (TH8 ambient temp.)

High pressure too high 57

Emergency run(slave)

Sensor broken (TH9 outlet coil) 35

Sensor broken, high pressure 58

Outdoor storage malfunction(slave)

Sensor broken (TH10subcool outlet)

Discharge temp too high 59

Ambient temp exceed the limit(slave)

Sensor

broken (TH11subcool

suction)

High pressure too low 60

Water temp. too high or low (slave)

Sensor broken (TH12suction) 38

Super heat too low 61

Insufficient water flow (slave)

Emergency run 39

Low pressure too low 62

Digital comp overload(slave)

Outdoor storage malfunction 40

Sensor broken, low pressure 63

Fixed comp1overload(slave)

Sensor broken (indoor inlet coil) 41

All indoor units and outdoor units t

communication malfunction

Fixed comp2 overload(slave)

Sensor broken (indoor mid coil) 42

Outdoor unit and elec.

power dist.

communication malfunction

Fixed comp3 overload(slave)

Sensor broken (indoor outlet coil) 43

Ammeter and elec. power dist.

communication malfunction

High pressure too high(slave)

Sensor broken (indoor return air )

The following for the Slave units

Sensor broken, high pressure(slave)

Sensor broken (indoor supply air) 44

System malfunction 68

Discharge temp too high(slave)

Indoor and controller

communication malfunction

Sensor broken

(slaveTH1 discharge temp.)

High pressure too low(slave)

Ambient temp exceed the limit 46

Sensor broken(slaveTH2 inlet coil 1#) 70

Super heat too low(slave)

Water temp. too high or low 47

Sensor broken(slaveTH3 mid coil 1#) 71

Low pressure too low(slave)

Insufficient water flow 48

Sensor broken(slaveTH4 inlet coil 2#) 72

Sensor broken, low pressure(slave)

Controller storage malfunction

Indication light twinkle related to the code of malfunction:

Type Heat

Sleep/Fan

Dry

Type Heat

Sleep/Fan

Dry

Type Heat Sleep/Fan

Dry

Sensor , indoor Off

Off F

Sensor, outdoor Off

F F

Pressure sensor,

outdoor

F F On

Pump , indoor Off

F Off

Overload , compressor

F F Off System failure F F F

Communication F Off Off

Pressure high/low F Off F Others F On On

Note : “ F” means “ flash” , “ On” means “ light on” , “ Off” means “ light off”

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McQuay MDS300B Manual de instalación Pagina 7

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