Air con runs for 5 mins then stops, unit outside still going
Turns on then runs about 5 mins and fan and heat stop, the unit outside is still going but the fan and heat inside isn't, sometimes even feels like cold air is coming in without the fan.
This happened a couple of weeks ago when first turned it on for the new season, but then ran fine for about a week, now is doing it again.
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Re: Air con runs for 5 mins then stops, unit outside...
Ok depending on what part of the world your in and the season .
Winter: most split systems are designed around a set given temperature of operation , if this is a heating problem the what you are experiencing is the system going into deforest . bare in mind that those carrier splits are manufactured in china and are designed for about 35 deg C in summer and +5 in winter , anything out of this temp range will cause this , especially if it is running on freon 22 , in-which case it sounds like its short of gas to me . if its a new R410 a system , then check your filters and if they are clean and its still doing the same then it too is short , in each case a refrigeration mechanic is required.
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Seems like the fan relay has stuck (Likely to be on the main indoor PC board) or if the machine was being used on heating mode, the indoor pipe sensor may have failed causing the fan to continue to run. Most air cons on heating mode, will keep the fan running for a few minutes after you switch off on heating mode to cool down the indoor unit before it turns off completely. The pipe sensor signals the main PC board to tell it that the unit has cooled down and can now turn off completely. If either of the above faults occur, the indoor fan will keep running all the time.
Some heat pumps have high and low pressure swiches installed to keep compressor from running when unsafe conditions occur that can damage the compressor. If the outside fan is not turing on, the unit is cycling on high pressure, if you see ice forming on the big refrigerant line coming from the air handler, then the compressor is shutting down on low pressure. Low pressure can be cause by lack of air flow through air handler or from a low refrigerant charge.
If compressor stops in middle, check the following. 1.Thermostat setting must be minimum +3 degree than your room temp 2. Check it's in heat "mode" 3. Check indoor and outdoor coils are clean. 4. Check fan motor is working alright. 5. Outside sensor and room air sensor is placed correctly. 6. Gas pressure is o.k 7.Check compressor is overheated, even all the above is o.k.
See if you can reposition the thermister on the facing of the evaporator coils. That could be it or the thermister might be bad. They don't use copper/mercury sensing bulbs these days. They use these cheap thermisters.
More likely the out door fan motor has bad bearings and that would cause the out door unit to run for 15 to 20 min but it could be low on freon
when the out door unit runs after 3 to 5 min the larger of the two copper lines going into the unit should be ice cold
If the thermostat you just installed has a time delay that will keep the indoor blower motor running for up to 5 min after the unit shuts off
be aware that not repairing this asap that you are causing yourself more problems First I would change out the fan capacitor and see if this could be the problem. Secondly if the capacitor isn,t the problem change out the motor . By continuing to allow the system to cycle like this the compressor will take a dive on you costing more . Good Luck
Capacitor, dirty condencer coil causing the motor amps to run too high. But most likely worn bearing on blade side of motor causing it to pull to one side causing it to over heat and shut down. Sleve bearings should have no side play.
The outside fan should be running except when the Heatpump goes in to defrost mode. Then the fan stops with the compressor running and it switches the reversing valve to heat up the outdoor coil. That should last about 5 min and you may see steam come off of the outdoor coil. That's normal. Is the compressor running? It's possible that it's stuck in defrost or the fan simply died. I hope this helps.