Guys,
Another fault now it seems... having had the return air sensors replaced sensors to remote sensors on the LG multisplit of mine there is now a new problem come to light.
The bedroom unit seems to have developed a problem in that when the living room is switched on and is at thermostat on & when the bedroom unit is thermostat off the unit should sample the air by running the fan every minute for 10-20 seconds or so until the heat is cleared from the coil and the coil sensor detects the coil is cooler again it goes off again sampling the air again later.
Obviously only if the coil is upto temp otherwise it doesnt do this... All good so far. However after the first 10minutes of the units being turned on its doing the air sampling correctly, fan on for 20seconds then fan off for another minute but after a while the bedroom unit seems to stick on air sampling mode and the fan continues to run blowing warm air continuiously (despite thermostat off) due to EEV valves being opening slightly continual blowing of warm air is heating the room up .
If I put the set point to 16C from 22C this doesnt make any difference. Its as if the coil being warm is causing the fan to run continuously and the coil is staying above the cold air prevention point. Set point of 18C room temp is reaching 25C with the constant fan running air sampling.
Its not the remote sensor i installed as if I have the bedroom unit only switched on cuts in and out fine. Also if I change the fan speed from high to low the fan stays on low which if the unit was calling for heat the fan would switch to high so I know its not the sensors. We have also swapped sensors round to the living room and problem stays with the unit.
I am wondering why the fan is continually running on the bedroom unit even after thermostat off. This is more than the air sampling its just continually running. If I turn the lounge unit off though the bedroom unit then goes off and as the coil goes cold the fan shuts off then. Its as if due to the coil being warm the fan is running all time despite unit being in thermostat off.
Normally in air sampling the fan starts and you can feel a blast of warm air but after 10seconds or so you feel the air start to get cooler then cold air prevention kicks in due to low circulation of refrigerant and then the fan cycles off again till the next air sample is due a minute later this is causing lots of residual heat to be released into the room with the room temp continually rising unless I turn the unit off.
The air blowing during the air sampling does not get cooler so its as if there is higher than normal refrigerant circulating inside the unit? Could the EEV be opening too far allowing more refrigerant to circulate and a higher coil temp?
The bedroom unit if switched on its own works fine and cuts out on thermostat off.
The unit is not on High Ceiling mode nor does the compressor seem to speed up when this is happening.
I can never get any response from the installer and no other engineers will work on another installers install as its under warranty so I dont know what to do.
Any ideas?