Lincoln University, PA

Equipment is 4 Ton AC with gas funace. Dates to 2000 26 years old. Outdoor fan not running. Determined that this was caused by the wire for the run winding of the condenser fan was detached from, capacitor. The capacitor was reading within specs so I offered to either repair the wiring, or giving that the one terminal on the capacitor was burnt to replace the capacitor altogether. I replaced the capacitor (55/5 uF) and redid wiring with new connectors. *Contactor is newer and there is a Superboost hard start kit. Afterwards tested system. Found r22 pressures to be low. System is undercharged on r22 which is an outdated refrigerant. 245/58 40SH 4 SC outdoor temperature 72° System will not cool well of at all and the indoor AC coil could freeze. She is going to keep an eye on it for now. She will call us for consultation after looking at her schedule The only feasible solution is to upgrade/replace HVAC system. System is well beyond replacement age. Homeowner decided on diagnosti

Reviewed indoor and outdoor equipment. Replaced customer supplied filter. Inspected all coils and sensors. Removed outdoor coil sensor and checked resistance, reading 260 ohms. Nee sensor was reading 6500 ohms. Installed new outdoor sensor. Cleared all alerts and tested system operation and checked charge. Provided instructions on thermostat operation. We will provide a 1 year extended labor warranty on system as per Joe

5/27/26. Fully assessed issue on 2025 trane link heat pump system. Found trane link thermostat displaying can’t read outside coil sensor. Talked with tech support. Check link outside board for 3 to5v output dc voltage. Voltage was 3v dc. Checked resistance of outside coil sensor. At 75 degrees it should be 10,000k ohms. Sensor tested at 205 ohms. Failed outside coil sensor. Also tested eev sensor it tested at 9,000k ohms which is correct. Need to order correct sensor and return to replace sensor. A/c is working at time of service.

Luis 5-1-26 no het we performed tune up yesterday, nothing is running. Found 3 amp fuse open. Installed new fuse and test operation, as I was putting door back on outside unit fuse tripped. I check all low voltage wiring, and loads, make sure nothing was damaged, tighten all wire nuts. After doing that unit was running normal and stayed running. No charge warranty from yesterday visit.

No heat for first floor system. Homeowners experienced power outage last night. Second floor system ok. Thermostat is blank but I had 24V at the furnace control with an idle status. 3A resettable fuse was not tripped. There are no open safeties and 24V to the thermostat Thermostat has failed. Homeowner agreed to install Honeywell S1200 Smart Thermostat. Mounted and wired today. Used the black conductor to the L terminal to control humidifier from thermostat. Also determined that the humidifier solenoid has failed. It is shorted and whenever energized causes the 3 A fuse to pop. Provided email estimate to replace solenoid. Left it unwired for now. And configured thermostat to NOT have humidification until solenoid is replaced. I checked the ohm value of the outdoor unit contactor as well which is another component that can commonly short out during a power outage found to be good. (21 ohms) Tested gas heat and heat pump operations before. Good System operating well at this t

Luis 1-23-26 customer called in for issues with the first floor geothermal package unit. Customer has two geothermal units, one in the basement package unit and one for the second floor located in the second floor attic geo split system with geo side in the basement, second floor unit is running fine. Customer stated first floor has the issues. System going off on high head. As I was inspecting the unit, I noticed tons of dye sign inside the compressor cabinet. I reset the unit and unit runs for about a minute and then shuts off on pressure. Customer does not know what other contractor did last time they were here. I told customer before any other troubleshooting. I will have to remove refrigerant. Customer approved procedure. After removing pound and a half of refrigerant pressures came down and the unit stayed running, adjusted sub cooling and superheat based on manufactured data. Check supply and return air temps ok good split. Water pressure and temps ok. Cycle heat pump ok. I repl

Unfortunately Trane sent us the wrong parts. We need EEV head Trane sent us the EEV valve… And what Trane calls in their nomenclature the discharge temperature sensor. I forwarded information to management and plavced a call to Trane tech support. It has to be a specific style of discharge temperature sensor. A pipe clamp style. We will order discharge temperature sensor AND EEV head and return asap. There were no error codes when we showed up today.

Found error codes in history for compressor dome sensor error. Recommend actions with the advice of tech support is to replace the dome sensor. They also recommend that I take sensor off pipe and clean sensor and the section of pipe it was clamped to itself. After I did this I had 0 error codes for compressor dome sensor. Used the outdoor dome sensor ohm chart and found it to be 18-22° off. Also want to replace the outdoor eev based on head pressure climbing on maximum compressor rpm. Found (4) supply grilles closed almost completely shut. Opened all. The bathroom one I only partially opened. This alleviated static pressure by .45” We will order dome sensor and outdoor eev and return to replace. Thermostat was satisfied at 72° when I left. Left thermostat at 72°. Told them they should expect the heat pump to run all night when temperatures are this cold outside. That is how inverters work.

Fully assessed no heating situation. Found heat pump running when I arrived. R454b refrigarant pressures were 354/45. System then went through defrost cycle. Refrigerant pressures were then 332/54. Found that the thermostat was set to 74 and only reaching 69 degrees. Found system is consistently locking out on dohm sensor. Checked resistance of dohm sensor it is a 10 k ohm sensor at 70 degrees. Sensor was reading about 8600 ohms. Found that as the system was running eev valve was consistently freezing on the one side. And when system was at 100 % suction pressure was only 45. Will go over all info with tech support. Also found that there were no software updates in app. Heat pump is working but not at 100%

Arrived for system, not shutting down. When looking at the thermostat, the system was showing emergency emergency heat and was set for 72 and was only 70° went into the error codes and it has some compressor dome sensor errors. And then went into a hard lockout. My air filter was clogged it was from 7/1/25. I replaced the air filter that is supplied by the customer, I ran the system in test mode for heat found system was overcharged at 487 psi which was tripping out the dome sensor. I pulled out the system. Unit is now at 325 psi and 74 psi . The customers will let us know how the system is running no charge new install