Sorry for the lengthy post, I've been going trying to get my AC and Hot Water both functioning for over a month now... 6 service calls, still no resolution on the AC issue, still problems with the heat.
The ongoing behavior is that the breaker for the AC Compressor is continually tripping, with between 15 minutes and 8 hours time between trips.
I'm hoping to gather enough information for the next HVAC specialist I call, so they don't repeat steps or just tell me to replace the whole unit.
Equipment I've got:
Monitor MZ25S tankless hot water heater
Goodman CK36-1A Compressor
The hot water heater has been a bit dodgy since I've owned the place (2 years), but aside from the coil in the AC freezing about a year ago (replaced the air filter and it's been fine up until now) it's worked fine.
These problems started last month, when I came home to a 90+ degree apartment, as well as a loud "clicking" sound from the 3 way valve on the hot water heater.
quoted sections are the work orders from the companies.
Call 1 (Company #1):
No A/C No Hot Water. Tech found that the system had no water in it which made system work against itself so tech filled the systemBasically, he told me that because there was no water in the system, the three way valve was going haywire and sending hot air through the AC even when it was set to cool.
Refilling the valve, and turning the hot water heater to "summer mode" (which I think blocks it from sending hot water to the AC?) seemed to work.
The next day, I noticed cold air had stopped coming out of the system - the condensor unit on the roof wasn't on so air was circulating but it was all room temperature
Call 2 (Company #2):
(No/AC) Found breaker to condenser tripped. reset. Found burned contacts on contactor. Replaced contactor & tested operation. Compressor (13.4 of 19.7 RLA) <check> Condenser Fan Motor (.8 of 1.1 RLA).
System running well inside. 3CAmp breaker range on both legs. Pressures not where they should be (high head pressure & low suction). Cleaned with water,
pressures did not change, added refrigerant, suction pressure did not come up. Problem most likely in the expansion valve.
Parts replaced -
Contactor 30Amp /2 pole / 24V Contactor
note: at no point did the contractor ever mention he thought it was related to the expansion valve, I just noticed this going through the work orders now.. this was discussed as a side thing to fix but unrelated, and not an urgent fix. Could this be related?
Call 3 (Company #2):
(Breaker ripping) found Breaker shorting . Pulled breaker & found multiple breakers that had been burned. Recommended hiring an Electrician to fully go through the panel. Breaker for Boiler also burned + broken and may be causing issues with boiler.
Call 4 (Electrician)
had electrician replace breakers, switch position since the bus bar was a bit burned. Damage to the bus bar wasn't bad enough to warrant replacement at this time.
Call 5: (Company #2)
(No Hot h20)
Found Actuator Not Attached to Valve Body. Attached & Tested Operation. Valve Clicking & Should be Replaced. Relief Valve Dripping, unable to check expansion tank (system Pressure @ 7 psi)
Recommended: Replace 38PSI relief + Expansion Tank, expansion tank must be OEM replacement.
Capacitor reading 40MFD/45 MFD
Replaced Capacitor & Checked amperage on L1 & L2 - 14.7A / 14.9A. Unable to recreate breaker tripping.
Call 6 (Company #2)
Ran A/C & Obeserved Ampergage. Compresser + OFM Drawing 14.5 amps -14.95 amps. Checked resistance across compressor (OK). Checked wire nuts on low (ion?) voltage of contactor. This caused the contactor to release + snap bakc in. Drew 52 Amps on LI & tripped breaker. Checked voltage @ coil of contactor (21 VAC) . Voltage @ Transformer of Allt (21 VAC) . Multitap transformer Using (240V) tap with supply voltage of (208). Change to (208 VAC) tap. Now have (26 VAC) to coil of contactor.
The breaker then tripped 20 minutes after this call, and is still tripping, between every 15 minutes, up to maybe every 8-10 hours in some rare instances (mostly between 15 minutes an an hour or two though). I talked to the company
#2 and they said they couldn't help me any more, and offered to refund one of the calls. Couldn't recommend someone else to continue work on it, wouldn't help me further other than saying if I wanted to replace the whole compressor / condensor they could help.
I'm going to start looking for someone to work on the hot water heater (replace the expansion valve, maybe the ionization probe or whatever the "reset" button is which pops when there's too much heat... I have ongoing problems with this resetting between uses). However, I'm I'm not sure if and how that could be affecting the AC breaker tripping?
I'm also hesitant to call another HVAC company until I have some more possibilities for them to try regarding this - I've done some googling and most of the suggestions I've seen (capacitor, etc) were already looked into. Also, despite the tech saying he saw it read 52 amps and trip the breaker, it actually tripped 3-4 other times when he was here last and I didn't see him mention anything about the amperage increase.
Anyway, apologies again for the lengthy amount of info... anything not tried here which I should have an HVAC company try?
Also, are there any listings on this forum or elsewhere for real HVAC experts, who might specialize in these kind of issues which have stumped other companies? I'm in the New England area.