I have been in the HVAC field for the past 18 years. I can help with most HVAC questions. I work on commerical buildings for the most part, and have yet to find anything I could not troubleshoot and repair, when repairable. I work on small 1 ton units to a 2500 ton chiller. Troubleshoot air flow, elect, and control problems. I attend regular classes to keep up with the latest and greatest.
I work on commerical sites, hospitals, gov't buildings. I can troubleshoot just about anything in the HVAC business.
5 years trade school, VFD training classes, Liebert factory training, some York and Trane factory training.
Always a new challange, and a different problem to solve.
If we were to have to run a new line set we would do what we could, then sub out anything we do not do or could not do. (WE = the mech. company I work for). So we would make the hole then hire a roofer
It is unlikely sewer gas is getting into the a/c system. In many areas it is against code to do that. A/c units normally drain onto the ground or something like that. Without being able to check out
When the sump heater was replaced, it was likely found during the repair. It may not have been the root of the problem, but a secondary issue. The heatpump might be on its own well, I do not know without
You are lucky to have a unit stat is still running after 30 years. Most units in FL, only last 15-20 years. The reason to keep the oil warm is to keep the refrigerant from saturating the oil. Many
The sump/crankcase heater is not going to cause the problem you are describing. The thing I would check first is water flow. It sounds like the unit is running for a short time then tripping on high
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