Gas and Oil Home Heating Furnaces - Heat Pump reset

I have a Lennox 461-1P 3 1/2 ton Heat Pump that seems to cool OK while the temperature remains at 95 degrees or less. However, when the temperature goes over that to 97 or 102, the unit compressor shuts itself down. I can go outside and push the compressore reset and it will run again for a short time and shut down again. I paid a repairman to check out the unit. The freon is fine but he believes the pressure build up due to heat is the problem. He washed the coils out for 10 or 15 minutes, but I had the same problem later that day. I have washed the coils very thoroughly myself over every square inch, but the unit still shuts down. It has a one year old blower motor with a new capacitor and a new coil fan motor with an old capacitor. I have to reset the unit everyday and my wife is going to kill me if the heat doesn't kill her first. Any suggestions?

should have been replaced when fan motor was.I am not there but is a rule of thumb...new motor,new capacitor.Your service person should have blocked 50% of condenser coil and test ran unit to see what pressures turned out to be.You can get by if you direct a water sprinkler into condenser coil.PDF

If this problem started after the motor was replaced I would check or have checked the following. 1. Is the motor the correct rpm and Hp. 2. Is it rotating in the correct direction. 3. Is the fan posistioned correctly on shaft relative to the shroud. Teck should have check also that the head pressure was indeed climbing to the set point of the switch, generally around 400lb.

You are deffinetly going out on high head pressure. The reason it would start running after he hosed it down was he lowered the coil tempature thus lowering the pressure.there are two reasons for this. 1) your A/C unit is over charged with freon. Or 2) your condenser fan is not doing the job cooling the coil.I would start with making sure that the fan motor is the right motor for your unit. It also could have been bad out of the box but he should have seen that it wasn't working right. I can't tell you what size motor goes on your unit with out know the size of your unit ( 3 tons or what)

All above replies are good. Lennox used alot of different speed(R.P.M.) motors. If the speed is wrong than this could be causing your trouble. Also, Lennox used alot of "double-row-coils" in there outside units. If you have a double coil, the only way to get the coil truely clean is by disassembling the unit and splitting the coil. Call the tech back and make sure that he does his job right this time!