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Design & installation Guide For McQuay MDS Multi System
7.2 Indoor Unit Malfunction Code
7.4 The Following Phenomena Are Not Unit Malfunctions:
Some odorous gas blows from the unit, because the unit sucks cigarette smoke and smell from
cosmetic, furniture and electric machine. We always hear fizzle from the unit when starting stopping
the unit, as the refrigerant flows in the unit. Sometimes we may hear click noise, because the
temperature change causes other parts expanding with heat and contracting with cold. The outdoor
unit generates buzz because of loading/unloading the digital scroll compressor.
Type Heat Sleep/Fan Time/Dry
Sensor broken (indoor temp.) OFF OFF F
Indoor Water pump OFF F OFF
Indoor and outdoor communication malfunction F OFF OFF
Sensor broken (outdoor temp.) OFF F F
Overload, Compressors, Digital/fixed F F OFF
Pressure, Too high/too low F OFF F
Pressure sensor, Outdoor F F ON
System malfunction F F F
Other malfunctions F ON ON
F1 Sensor broken (indoor inlet coil)
F2 Sensor broken (indoor mid coil)
F3 Sensor broken (indoor outlet coil)
F4 Sensor broken (indoor return air )
F5 Sensor broken (indoor supply air)
F6 Indoor and controller communication malfunction
FA Controller storage malfunction
FB Water pump(indoor drain pump)
FC Indoor and outdoor communication malfunction
7.3 Indication Light Twinkle Related to Malfunction Code:
Notes:
1. The mode confliction alarm is canceled, as it is not a malfunction, but a limiting operation. When
the mode confliction occurs, the indoor unit stops directly without making alarm.
2. The indoor and outdoor communication malfunction only belongs to this unit.
3. Simplify the light twinkle indication, and the indoor and outdoor malfunction contains master and
slave unit.
For example:
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