Good morning!
I had two York YP9C (97.5%) furnaces (60 and an 80) installed back in early December 2021. After getting multiple quotes, we decided to go with our neighbor who is a York dealer. Although he wasn't 100% sure about how residential modulating furnaces work (done more in the commercial space), he was confident on installing them. We originally had two Frigidaire (Nordyne) furnaces, a 72,000 80% heating approx 800sqft (4th floor in a 4 level split) and a 120,000 80% heating roughly 1600sqft (basement, main and 3rd level). The 4th level furnace was hitting the high limit temp switch (was fine during our home inspection before buying the acreage August 2021). HVACR specialists came in and determined it was most likely a cracked heat exchanger. Decided to just upgrade both furnaces at this time, bite the bullet. Note: upon removal, BOTH furnaces were perfectly fine, neighbor was going to resell them as we didn't need them.
The final install of everything looks great. Inspection passed and nothing sloppy about it. The one caveat was that I had to do the thermostat setups (Johnson Controls THXU 280) for the type (modulating) and enable all of the alerting options. It was approx $***** difference between my neighbor and a more established company that does these furnaces often. With the price difference in mind, I didn't mind learning a thing or two and helping out a local small business.
Every time each furnace has to heat up in the morning, it routinely gets the 5 amber flashes, ID: Air blockage warning. Sometimes during the day, during a heat top off (maintaining 21c), it sometimes gives the error code on each furnace.
All 2" intake and exhaust piping don't have any short radius bends, virtually all changed out to long radius 90's (part of the troubleshooting process). Exhaust pipe is slightly tilted to allow condensation to drain back. Total calculated length is approx 32 feet, well below the 55ft limit for 2". All condensate drains are independent and even got an extra 5" on each to help with flow, anti-syphon. Both gas valves have been set approx to 3.5WC. There is nothing blocking either pipe once it leaves the house.
My installer has reached out to York multiple times, one time getting him to reduce the gas pressure below optimal limits, still causing the 5 amber flashes but then also ignition fails for the 60K unit. Both units have since been put to the 3.5. I'm at 2100ft elevation and read that these furnaces are supposed to de-rate on their own. He apparently was also told by a York tech to turn off the notifications on the thermostat and furnace, hide the issue because the furnaces technically still work (albeit at a reduced capacity).
I'm at a loss. As a homeowner, I shouldn't have to be troubleshooting this early in. My installer has mentioned numerous times that he won't let me down, abandon me, but he's at his point where he's now thinking its my duct work. As far as I know and from seeing most of the install, no static pressure test or heat rise/drop measurements were done. I thought I'd join a forum, post and pass on any expert advice for him to complete.
I can provide full model names and pictures if that helps.
MK
Pricing is not allowed by forum rules.
Edit: both furnaces are on large stands, full height of filter. 5" MERV 11 filter. Air is pulled directly underneath, standard vertical upflow install.
I had two York YP9C (97.5%) furnaces (60 and an 80) installed back in early December 2021. After getting multiple quotes, we decided to go with our neighbor who is a York dealer. Although he wasn't 100% sure about how residential modulating furnaces work (done more in the commercial space), he was confident on installing them. We originally had two Frigidaire (Nordyne) furnaces, a 72,000 80% heating approx 800sqft (4th floor in a 4 level split) and a 120,000 80% heating roughly 1600sqft (basement, main and 3rd level). The 4th level furnace was hitting the high limit temp switch (was fine during our home inspection before buying the acreage August 2021). HVACR specialists came in and determined it was most likely a cracked heat exchanger. Decided to just upgrade both furnaces at this time, bite the bullet. Note: upon removal, BOTH furnaces were perfectly fine, neighbor was going to resell them as we didn't need them.
The final install of everything looks great. Inspection passed and nothing sloppy about it. The one caveat was that I had to do the thermostat setups (Johnson Controls THXU 280) for the type (modulating) and enable all of the alerting options. It was approx $***** difference between my neighbor and a more established company that does these furnaces often. With the price difference in mind, I didn't mind learning a thing or two and helping out a local small business.
Every time each furnace has to heat up in the morning, it routinely gets the 5 amber flashes, ID: Air blockage warning. Sometimes during the day, during a heat top off (maintaining 21c), it sometimes gives the error code on each furnace.
All 2" intake and exhaust piping don't have any short radius bends, virtually all changed out to long radius 90's (part of the troubleshooting process). Exhaust pipe is slightly tilted to allow condensation to drain back. Total calculated length is approx 32 feet, well below the 55ft limit for 2". All condensate drains are independent and even got an extra 5" on each to help with flow, anti-syphon. Both gas valves have been set approx to 3.5WC. There is nothing blocking either pipe once it leaves the house.
My installer has reached out to York multiple times, one time getting him to reduce the gas pressure below optimal limits, still causing the 5 amber flashes but then also ignition fails for the 60K unit. Both units have since been put to the 3.5. I'm at 2100ft elevation and read that these furnaces are supposed to de-rate on their own. He apparently was also told by a York tech to turn off the notifications on the thermostat and furnace, hide the issue because the furnaces technically still work (albeit at a reduced capacity).
I'm at a loss. As a homeowner, I shouldn't have to be troubleshooting this early in. My installer has mentioned numerous times that he won't let me down, abandon me, but he's at his point where he's now thinking its my duct work. As far as I know and from seeing most of the install, no static pressure test or heat rise/drop measurements were done. I thought I'd join a forum, post and pass on any expert advice for him to complete.
I can provide full model names and pictures if that helps.
MK
Pricing is not allowed by forum rules.
Edit: both furnaces are on large stands, full height of filter. 5" MERV 11 filter. Air is pulled directly underneath, standard vertical upflow install.
source https://hvac-talk.com/vbb/threads/2236458-Issue-with-2-new-brand-new-York-YP9C-Modulating-furnaces?goto=newpost
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