Faulty ac

[james770]

Hi,
l was working on a carrier split expression unit 2.25hp.The unit works for 15mins and cuts out.The unit doesnt have any safetys like lp or hp.Then the indoor unit light flashes 5 times.l`ve checked the fault codes and it say`s it could be the compressor or low refrigerant.l`ve got my guages connected and the pressures are good. l checked the compressor the windings are good and not down to earth also took the amp draw which is also good.But the compressor is pretty hot,if it is going out on internal overload it wont start back within 5min.l`m thinking it might be the indoor coil sensor which is giving a false reading only 70% sure.

[nike123]

Post here your temperature and pressure readings. The "good" doesn't give any value to us.
In order to properly evaluate the system, we need the air in/air out temps for both coils, the suction line and liquid line temps, and the pressures.
Also, before measuring, clean your filters and coils, and check for proper air flow!

[james770]

Suction 400kpa Discharge 1410kpa
Indoor coil supply air 12 degree return air 24 12k split reading.Amp draw for compressor 6.3amps.Filters clean outdoor coil clean.

[TECH TIM]

hi i dont do too many carriers not sure wat fault code is if it says comp or gas and all checks out id suspect sensor or pcb fault, check for roaches or signs of rats chewin wires i see that a bit id call carrier and find wat causes fault code ie which sensor(s) etc for example if indoor pipe th senses i/d coil below zero it may shut unit down i have a number (02)92024100 you could try good luck with it all

[amitsaxena]

Dear Check, for is there any economy mode is there as the unit behaviour is normal.

[james770]

It`s all good now it was the indoor coil sensor thanks