Lincoln University, PA

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

Found system has lost pressure from nitrogen was added from 250 psi to 148 psi. Checked all refrigerant joints in the system with 400 psi nitrogen. Found another leak at suction line 90 at outdoor unit. Re brazed and cleaned up all joints . Also insulated condensation pump. Replaced Exsisting bi flow filter dryer and vacuumed down system to 410 microns. Added in 8lbs 2ozs of r454b. Checked temperature rise it was 22 degrees. Checked refrigerant pressures they were 392/72. Heat pump is working properly at time of service.

Found blown blower motor surge protector. Replaced today. The power monitor protected the outdoor unit circuit. After starting system got error codes for low suction pressure. The earliest incident of low pressure error was on NOV 27.; System is at 45 psi standing pressure on high side port. 0 psi on true suction. I pressurized system with nitrogen to 250 psi. There is a micro bubble (very small) leak on a joint at liquid line near filter drier. Left disconnect OFF at outdoor unit. Please leave it off. We will schedule return for repair ASAP. System will run on emergency heat for now. I charged for surge protector only.

Luis 11-7-25 performed propane gas heat tune up for first floor Lennox heater and second floor daiken. Check all electrical connections and components low and high checked propane side ignition parts ok. Blower motor and wheel ok. Test and inspect combustion removal system ok. Performed combustion test on both heaters ok. Check temperature rise across heat exchanger ok. Both heater are working properly at the time of service. Customer has two humidifier that don’t work. One of them (first floor is connected to nest thermostat) it doesn’t send voltage to humidifier valve, other humidifier needs new water solenoid valve (second floor). Last technician went over water, surge and bacteria protection. Each unit has air scrubber and both if the, not working. Provided estimate for recommendations.

Completed heat tune up for 3 Ton Carrier heat pump system with 10KW electric heat kit Filter ok Indoor and outdoor coils in good condition Inspected wiring, controls, electric motors and components; left estimates for surge protectors; 10KW electric heat amps: 39 Good Measured temperature rise and static pressure Inspected drains; cleared, tested pump; added treatment tabs to drain pan. *System still running in cooling will continue to produce condensation at indoor coil. Checked integrity of compressor motor (mega ohm test) Assessed refrigerant charge checked pressures. AC system operating well at this time.

Completed (2) AC tune ups. 1st Floor system 3 ton heat pump 2nd Flppr system 3.5 ton heat pump. Replaced both 20x25x5 filters provided by homeowner. Inspected wiring, controls, electric motors. Left estimates for surge protectors Checked drains. 2nd floor system does not have EZ trap. Left email estimate. Also left estimate for (2) wet switches for drain pans. These are more reliable water safeties. Measured temperature splits Verified integrity of compressor motor; megaohm test, Checked refrigerant charge and pressures: Ok Both heat pumps are out of manufacturer warranty. Heat changer was replaced 3/13/24 for 1st floor Lennox furnace. 2nd floor furnace is from 2019 Daikin. Emailed recommendations.