Air Conditioning Trouble Shooting
If you have trouble with your air conditioning system try some of these troubleshooting ideas.
UNIT FAILS TO START
First step is to always check the circuit breaker in the switchboard is on and also there should also be an isolator adjacent to the outdoor unit (condenser) that must also be switched on.
Are the batteries in the remote controller still charged, test with fresh batteries.
The Daikin systems have protection devices built in that will prevent the unit from operating if the system goes out of its operation parameters. If this happens, the system may shut down and not restart. If this occurs, go to the outside condensing unit and turn off the electrical isolator that is adjacent to the condenser or to the circuit breaker located in the switchboard marked “Air Conditioner” or “A/C”. Leave the switch in the ‘OFF’ position for 10 minutes, then turn it back to ‘ON’. In most cases this will resolve the issue.
If the unit does not start, a code may come up on the screen such as ‘U4’. Please take note of this code and ring our office on 1800 333 503 and we will get a technician to attend site.
Ensure the controller is set to the correct mode and that the temperature setting is correct. See section below UNIT RUNS BUT WON’T HEAT/COOL
During winter, the outdoor unit produces water, this is perfectly normal operation.
If you have a ducted system, there is a small pipe around 20mm in diameter that protrudes through your facia. This drains from a safety tray that is located under the air conditioning unit in the ceiling space. This pipe should NEVER flow. If you ever see water dripping from this safety drain, please turn your machine off and contact the office immediately on 1800 333 503.
If you notice a water stain on the ceiling, please turn your machine off immediately and contact the office on 1800 333 503.
Have you cleaned the filters? Blocked filters can reduce the airflow and cause the system to ice up creating water issues.
Have you got the temperature set too low (below 23 degrees)? On humid days warm moist air can condensate on the grilles and ductwork. As the supply air temperature can be as low as 16 degrees, this cools the surface of the grille and as warm moist air contacts the grille it can condensate and sweat. To help prevent this, run the air conditioner slightly higher, back off air flow (if you have an Airtouch Controller) to the affected grilles and ensure ALL doors and windows are closed upstairs and down.
Is the drain pipe blocked? This needs to be checked by an air conditioning technician.
If the return air grille is noisy, it is usually an indication that the filter is dirty and needs to be cleaned. You can do this be vacuuming it or by rinsing it under water and letting it dry. We recommend you clean your filter(s) at least once a month.
If the registers are noisy from the air ‘rushing’ through the supply vents, then you need to increase the number of zones selected.
UNIT RUNS BUT WON’T COOL
The system is a reverse cycle unit, meaning it heats and cools. However, you need to be sure that you have it set to the correct MODE.
If it is the warmer months, ensure the MODE is selected to “COOL”, and set the desired temperature.
DO NOT have ‘AUTO’ selected
If, for example, it is September and you want to cool your home, and the MODE is set to “HEAT” or “SUN”, it doesn’t matter if the temperature is set to 21 degrees, it will not cool while in “HEAT” MODE. You need to the change the setting to “COOL”. Be careful not to select “COOL” and “AUTO” in the mode.
UNIT RUNS BUT WON’T HEAT
As mentioned in above, the system is a reverse cycle unit, meaning it heats and cools. Be sure that you have it set to the correct MODE.
In the cooler months select the MODE to “HEAT”, and set the desired temperature.
DO NOT have ‘AUTO’ selected
If, for example, it is May and you want to heat your home, and the MODE is set to “COOL”, it doesn’t matter if the temperature is set to 30 degrees; it will not heat while in “COOL” MODE. You need to the change the setting to “HEAT”. Be careful not to select “HEAT” and “AUTO” in the mode settings.
It is also very important to ensure that the fan is NOT selected to “AUTO” in the fan settings as shown below as it can cause issues with the operation of the temperature sensors and may result in the machine failing to respond to changes in the temperature as quickly as desired. Please run the system in either “HI” “MED” or “LOW” fan only.
OUTDOOR UNIT NOISY OR VIBRATING
Mud wasps can sometimes build nests in the condensers or on the fan blades. This can cause the fans to hit the edge of the cowling. Please ensure the unit is kept free of wasp nests. One way is to use surface spray on the grilles to help repel the wasps. Mud nests are not covered by warranty.
DURING HEATING WHITE SMOKE COMES FROM THE OUTDOOR UNIT
This is not smoke but mist. During defrost, the system can blow out a large amount of water vapour that can look a bit like smoke, this is perfectly normal. It may also make a continuous “Shuh” noise at this time