Daikin Heating & Cooling - Recent Questions, Troubleshooting & Support

Question edited for clarity Dakin > Daikin. Question moved from Mini (car) to Daikin AC. No, that is a huge waste of money unless the unit cools the room beyond the interior door. Keep the unit off until you intend to sit in there.

U4 Is a communication error between indoor and outdoor units. usually means one of the PC boards is faulty. If unit has been freshly installed check wiring between indoor and outdoor 1,2,3 are the same colours on both boards.

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This is stating that there has been a low pressure error on the system.

This could have been caused by a blockage in the pipe work or a possible shortage of refrigerant. It could also be due to a fault with the low pressure sensor/switch.

This is stating that there has been a high pressure error on this system.

This could be due to fan motor or air flow problems with the condensing unit, but it could also be an issue with the high pressure sensor or switch

This is a communication issue between the sub remote controller and the master remote controller.

This fault occurs when a remote controller that has been set to sub cannot see the master remote controller that has to be installed on the fan coil.

Please check the wiring for the remote controllers to ensure correct connections, also if there is only one remote on the unit ensure that the Main/Sub switch is set to Main.

Signal transmission error (between indoor and outdoor units) which means a faulty indoor or (more likely) faulty outdoor controller board. Call a tech.

The way I understand it, the 'eye' is just an infra red sensor that detects when someone is in the room. If it doesn't detect anyone, it reduces its power usage until someone walks back in and adjusts accordingly.

first check and make sure the inside blower is running if so check to make sure the filter is clean if that's not if it may be low on Freon charge or the evap coil is dirty.

not sure was the compressor running at the time you were adding the gas.

check the fuse panel some times the fuses need cleaning or replacing the heat makes the copper pit /arc get someone that know what they are doing because this would be inside the panel. an easy way to diagnose this breaker over heating (use temp gun) an breakers makes a sizzling sound or static and might quit when touched or moved in slightest this can be traced/heard in am radio too it wont be a hum but a lot of static when near the source. i just pull (all the mains )an verify no power with my detector an clean an buff up all the connections an replace the damaged weak breakers an clip n strip a new area of copper on the wire leg if damaged.

If you have your Owner's manual, please check troubleshooting section. Should be a clue in there. It could mean filter needs to be changed, or possibly missing.

When the Operation lamp is flashing, the unit can't operate efficiently and has shut off. Check and clean the Air Filters. Check that nothing is blocking the air inlet or outlets (on all indoor units (if a multi-unit system) and the outdoor unit). Remove all obstructions. Turn the breaker to Off and then On again. Check if the unit works with the remote. If you have a multi-unit system, make sure that all indoor units are in the same Operation mode. If the units are on Auto, make sure that all units are set for Heat or Cool. If the unit continues to have the Operation light flash, then you need to contact your service professional. The Operation manual for the FTXS18HVJU is available here: http://www.daikinac.com/content/assets/DOC/OperationManuals/FTXS15_18_24LVJU%20Operation%20Manual.pdf I hope this helps. Cindy Wells

Outdoor unit will auto switch off when preset temp is reached, then switch on again auto as temp varies

try changing pipesensor or thermostat they are most likley to go on a aircon let me know if it worked it should cause i had the same problem with mine till i changed the pipesensor and thermostat

A- automatic, heats and cools snowflake- cooling mode sun- heating mode drip- dry mode

Insufficient gas. Need a tech to check for leaks, pressure test, evacuate and refill to correct levels.

Signal transmission error. Indoor and outdoor PCB's cannot communicate. Usually a faulty controller board in the outdoor unit. If the indoor unit otherwise functions normally (can control fan speed, louvres, beeps in replay to all remote buttons) then it is probably OK so check outdoor controller PCB.