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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22543
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Heat pump unit model # YHJD24S41S24 Manufactured in 2010 in

Customer Question

Heat pump unit model # *****
Manufactured in 2010 in Wichita.
Outside temp 80 F
Inside temp 77F
Thermastat set to 71 F
Inside humidity 68
Inside temperature does not drop.
Outside unit cycles on for 2 minutes then off for 5 minutes consistently over the past twelve hours.
Electrician just checked communication from inside control to outside control and signals appear to be good.
Any ideas why this is happening?
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.


There is one item that will cycle a unit like this.

It is a low pressure switch. When the unit kicks on the pressure is dropping ....eventually it trips a low cut off and then shuts down...once the pressure builds back up and equalizes the unit kicks back does this over and over.

You will need the refrigerant level checked. If it were high pressure it would not kick back on by itself...

Customer: replied 1 year ago.
Thanks I will suggest this to the HVAC tech when he/she arrives
Customer: replied 1 year ago.
What if refrigerant level is fine according to the tech?
Expert:  BillyHvac replied 1 year ago.

You are very welcome...given the safety circuit it is the only item that can cycle according to the run times you supplied.

Anything else would be more sporadic come and go failures. This will be directly related to low pressure.

OR...the low pressure switch itself is bad.