Lennox HVAC not cooling and heating


Old 06-18-19, 07:13 PM
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Lennox HVAC not cooling and heating

Hey everyone, I have a Lennox model LRP14HP48P and it seems to not be heating or cooling no matter what I set the thermostat to. All I know for sure is that the fan works when I switch it from auto to on. However, when I switch it to cooling or heating, I hear nothing and nothing happens. Any suggestions? Thanks!
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Old 06-18-19, 07:57 PM
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First thing to do is check for a call for heating/cooling with your meter. If the blower works then you know the transformer is working.
Old 06-18-19, 08:07 PM
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Welcome to the forums.

Are you going to troubleshoot and work on that unit ?
That's a 4 ton packaged heat pump. The blower is working which means the unit has power.
There may be more than one circuit breaker controlling that unit.
Does this unit have electric heat for winter backup ? See if that's working.

Next step is using a meter to check for power on the thermostat terminals inside the unit. If it isn't a thermostat problem then it may be the system is low on refrigerant and the safety pressure switches are keeping it from starting.

LRP14HP manual (pdf)
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