When the unit has been running for awhile, it stops and the red operation lights blink off and on for awhile and then the machine starts working again.
If a unit is in heating mode the outdoor unit is in cooling mode (outside always does opposite of indoor) after a while if there is a build up of ice on outdoor coil unit stops and puts hot gas through outdoor coil to clear it. The indoor fan stops to avoid and heat loss in area served buy unit once this has been done and indoor unit coil is hot again fan will start. This is the correct operation of the unit to save against bust could and reduced efficiency
SOURCE: Carrier Thru-Wall Heater and Air Conditioner won't heat
http://www.residential.carrier.com/support/troubleshooting.shtml
Here is some troubleshooting tips.
Also service available.
SOURCE: Fujitsu Heat Pump - problems
I had the same problem. The heater did not work in heating mode. However it was OK in air-conditioning mode. The operation light and the timer light blink twice and then the operation light blinks for 5 times followed by few seconds non blinking, then the cycle repeats again. I have read on the internet that you better unplug the power cord and then plug it again so that the heater re-sets itself. My only problem was that my heater is directly plugged to the power with no visible plug. So I went to the main distribution board and put off the power for about 20 seconds for the whole home. HOORAY!! The heater worked after that.
SOURCE: unit starts and stops to often
No this is not normal. You have a problem refered to as "short cycling". This is an indication of low refrigerant charge. You need to have the unit leak checked, repaired and recharged,
SOURCE: LG Ductless Mini Split System LAN125hv: Heat pump doesn't run.
CA: Compressor Discharge Sensor Fault
Contact a qualified service technician and have them replace this sensor.
SOURCE: Samsung AS09XLN air conditioner lights blinking
Sounds like a common problem I have found with Samsung mini split unit. When powering on, does the internal blower attempt to start, then the unit stops and lights blink? If so, on the circuit card there is a 1.2uf or 1.5uf (CBB61) that probably has gone bad. I have replaced several of these. Good luck.
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