McQuay Fan Coil Service Ankara

Please note: YOİ Mühendislik is not the manufacturer's authorized service for McQuay. As an independent service holding the TSE Service Adequacy Certificate (HYB No: 12850), we provide maintenance, repair and spare parts for McQuay fan coils. The brand name is used only to indicate equipment compatibility and belongs to its owner.

About McQuay fan coils

Origin: USA (today Daikin Applied). In Türkiye: Units installed in older projects.

We service all McQuay fan coil models produced over the years, based on the information on the unit's rating label.

Unit types

Ducted Cassette Floor-standing

Our services for McQuay fan coils

McQuay fan coil maintenance

Checks of filters, coil, drain pan, drainage, fan, valves and thermostat; documented periodic maintenance.

McQuay fan coil faults and repair

On-site repair of water leaks, no cooling, fans not turning, valve and controller faults.

Cleaning and filters

Chemical coil washing, drain pan disinfection, filters cut to size.

McQuay fan coil spare parts

Supply and fitting of compatible motors, valves, thermostats, pumps and other parts.

McQuay fan coil error codes

The codes below are compiled from the manufacturer's user and service documentation. Codes may vary by model, controller and board version; the safest approach is to send us a photo of the code on your unit's display.

McQuay MFU-C – AC2800 electronic controller

Faults are indicated by the number of LED flashes.

Code / indication	Meaning	What to do
5 flashes	Fan coil mode and water temperature mismatch (e.g. cold water in heating mode)	Check the mode selection and the chiller/boiler status.
7 flashes	Ambient temperature sensor malfunctioning	Check or replace the sensor.
8 flashes	Water temperature sensor malfunctioning	Check or replace the sensor.

Sources: document 1

Common thermostat warnings

Warnings shown on Siemens RDF series thermostats, which are often used with McQuay fan coils:

Indication	Meaning	What to do
AL1	External fault input X1 active (e.g. drain alarm)	Check the device connected to input X1.
AL2	External fault input X2 active	Check the device connected to input X2.
FIL	Filter cleaning reminder	Clean the filter and reset the warning.
Dew (condensation) symbol	Condensation detected in the room, cooling stopped	Check humidity and water temperature.

Is your McQuay fan coil showing a code?

Send a photo of the controller display and the unit's rating label and we will interpret it right away.

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McQuay fan coil controllers and thermostats

AC2800

Electronic controller

AC512 / AC513

Mechanical thermostat

In addition to these controllers, we replace faulty or outdated thermostats with new models suited to the unit's 2/4-pipe configuration, valve type and motor speeds: mechanical, digital, weekly programmable and Modbus / BACnet / KNX networked options. Thermostat options →