Rheem 2 ton cycling on & off

My unit outside is turning on and then 10 seconds later shuts off. The thermostat is a Honeywell RTHL 3550 model and is not clicking on like it used to. Not sure whether it's the outside unit or the thermostat. Please advise.
Thanks Fritoguy15

 

Have you checked to see if the primary condensate line is clogged-up and a float switch is turning the system off? After the system is off a while condensate water drains through the clog so the system is able to run again for a while again until the condensate water backs up again and the float switch shuts it down once again and it just keeps repeating over and over.

 

the outside drain line is dripping fine.

 

Is the outside drain that is dripping a primary drain or a secondary (emergency) drain?

 

primary drain, no secondary drain line.

 

I believe that is a battery operated thermostat.
That means there would be a cooling(Y) relay, a heating(W) relay and a blower(G) relay.
Relays not operating correctly usually indicate weak batteries.

If it's not a battery/thermostat problem then you will need a meter to check the 24vac line to the outside condenser. The problem your describing sounds very much like your are low on refrigerant and the condenser is cycling from the low pressure switch.

Please read first for A/C repair

 

The thermostat also has a R wire, and does have batteries in it. Plus the other wires you mentioned. I was wrong about the drain line it is a secondary line. Tech is coming later today to test for whatever is going on. Thanks.
Fritoguy15

 

If your secondary condensate drain line is dripping that definitely indicates the primary condensate line is blocked-up with a clog. The secondary condensate line should never have water coming out of it - even one drip.

Try to figure out where the primary condensate drain line is clogged-up. It may be clogged near the evaporator coil, or further down the line where is actually drains out. It may drain out to a bathroom lavatory just about the sink's p-trap, which is how most are installed to drain in newer construction. Regardless, the primary condensate drain line is clogged-up somewhere and needs to be cleared.

 

The drain line was clogged so the tech cleaned it out and we got our air back to normal. Thanks for all your help.
fritoguy15. 😎😎

 

Thanks for letting us know...