Raypack heat/cool unit cycles for 15 sec then shuts down for 3 mins and cycles for 15 sec again in cooling mode heater works fine. Any ideas? Unit is 6 months old and this is the first time using the cooler

Sounds like your you may have a dirty pilot assembly if your unit is a direct spark system. Also check ground wires are secure.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/jerry_8a145f1328fa119f

If there is 3 indoor units from one condensing unit
(6 pipes at outdoor unit) this is classed as a multi unit

All units will run correctly as long as they all require same mode, cooling or heating, if one unit decides to heat it will shut down until master unit decides to heat then it will start, for each unit to individually heat and cool there would have to be 3 pipes to each indoor,

Because its an air conditioner, not a heater?

may have air trapped in it still or thermostat is not working properly..

I have seen this in the past and it is the control board that is causing this problem.

Have you checked the high and low pressure switches on the unit? If you are cycling on and off, look at your pressure switches to see if they are opening during operation. Also, when was the last time you cleaned out the condensing unit coils with soap/degreaser and clean water?

Check the high and low snap disk and check wall thermostat if fitted.

I would replace the distributor stator and the TFI ignition module both of which are in and on the distributor. Use Ford OEM parts (Motorcraft) as after market fail very quickly.

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.

is the tstat in cool mode? if not hit the mode button untill cool pops up then hit the down airow untill desired temp. sometimes the thermostat has a 5 min delay so be patent. If unit still does not run call the service co. and find out about how long they warranty their service call. usualy one month.