Technical FAQs

The serial plate with unit information is usually found inside the unit on the back of the panel doors or the electrical pane

Press the Esc and Enter buttons together on the display to cycle through the different languages.

This could be an incorrect controller, display or EEV driver address setting on single or networked units. It could also be poor/loose cable connections between these components. After this it could be a possible faulty Pco controller.

The unit may need a remote hard wired signal from the BMS if required, to the Remote On/Off terminals in the unit or if supplied with a link in the terminals, this could be loose or missing.

Go to the Maintenance menu on the display and enter, scroll down until it asks for the maintenance password. This is 4648. Scroll down until Reset Humidifier Hours Run is highlighted, change the No to Yes and Enter. This alarm can now be cleared.

This is usually Water Flood Detection, Fire/Smoke link or Condensate Pump High Level trip.

Go to the Maintenance menu on the display and enter, scroll down until it asks for the maintenance password. This is 4648. Scroll down to Humidifier Maintenance where you can set Manual Drain to Yes to drain humidifier bottle.

This is shown when there is a break in the network of more than one unit connected as Run/Standby operation. A unit powered off or a break in the network cable between the units can cause this.

This is caused by low or no water flow through a unit. Check pumps are operating, check the water strainer/filter is clean and check the water flow paddle/differential pressure switch operate correctly.

Navigate to the Switch page in the menu, go to Switch 12. This should be Airflow fail Reset – Off. Move the cursor underneath the Off with the arrow buttons and press Up arrow. When asked for the PIN enter 4648 with the arrow buttons, then press the Up arrow to change to On. This should clear the alarm and start the fans.

This can be the Panel Door Interlock switch when the door to the unit is open or anything external wired to the Auxiliary Alarm terminal link. For example, fire or smoke detection.

The user is 0113 and password 0113.

This unit type controller requires a separate plug-in clock card, this will need taking from the old controller and plugging in to the new one when replaced.

This could be the suction pressure transducer or the electronic expansion valve driver that could have a loose connection or be faulty.

This is a water flow fail alarm. Please check pump, strainer and water flow

Some sensor and transducer readings can be offset usually by +/- 10 in the Maintenance menu, password is 4648.

This could be the cable between the display and the Pco controller inside the unit that has a loose connection. Also check the display address is set correctly.

This can be too little or too much water flow through the chiller evaporator. The low limit is 20kpa and high is 90kpa. Check water flow and water strainer on system.

There is no specific life span for a unit, this all depends on good maintenance of the equipment and the availability of replacement spare parts.

Please see the appropriate technical/installation manual for the equipment model. This contains a charging guide for the equipment. These are available on the website for the latest models.

Please see the appropriate technical manual for the equipment model. These are available on the website for the latest models.

On certain units there is an auto and manual reset overheat cut-out. The manual reset switch will require re-setting by pressing the small reset button on the cut-out switch itself, then the alarm can be reset on the unit display.

Please contact the Airedale Controls department with the unit serial number on 01132 391000.