muddy
July 27, 2025
I like most of all that the sellers wrote a quick suggestion note and placed it in the box for me to try if this did not totally fix the problem, which I will be buying soon. Great product, top notch seller I'm very impressed by him ! Will buy again from this seller.
NewsView
May 15, 2025
I moved into a home with a 2014 Carrier heat pump that every so often — usually at some point during the coldest days of winter — blows a 3 amp fuse. My first clue consisted of discovering that the prior owner, from whom we inherited a box of receipts, had gone through multiple thermostat replacements. But since the original HVAC installer was out of business, no help was to be found there. After both a fuse and a transformer blew on the indoor portion of the unit, we learned that the fuse on the unit was overrated by quite a bit. (By inference, the prior owner hired an incompetent tech whose answer to the same problem — aside from thermostat swap-outs — was to put an over-rated fuse on. It's a wonder the whole system didn't fry!)In year one of the problem, we swapped out the thermostat. In year two, we had the wiring from the thermostat to unit pulled and replaced. (Apparently the heat strips were also wired to run ALL the time which was causing sky-high summer electric bills on top of blowing fuses in the winter months.)The HVAC tech we hired runs his own business, while serving as a mentor to HVAC techs who are new to the trade, so we really couldn't do any better for our area — but nonetheless troubleshooting an intermittent fault is a pain in the ars. In year four, a "contractor" was replaced on one call, only for the fuse to blow on the coldest winter night we had this winter season. Each service call involved an attempt to meter the wires and check for breaks — but no clear explanation emerged. Nevertheless, the repairman would get the heat pump up and running again after redoing a possible "loose" connection — after which it would run another year and then blow the fuse another 2-3x in a row.At one point I searched the Internet for an answer and came up with a HVAC tech website discussion involving the claim that some of the Carrier PCBs had been upgraded to address some type of intermittent low voltage fault. As bad luck would have it, I lost track of the website before the fuse blew again so I was unable to pass what I found along to the tech. That said, each call to replace fuses and whatnot was setting me back about $300, so spouse and I decided to take matters into our own hands and replace the defrost board ourselves as a preemptive measure (cheaper here on Amazon than another service call!).Unfortunately, by the time we bought this board we're out of the cold winter months so it may take another full year to see if the problem is resolved for good (assuming it even has to do with the winter weather at all — it's possible the timing of the fuses blowing was just coincidental). If this should solve our intermittent problem for good, I'll update this review to let others know that this may be the solution for a hard-to-troubleshoot low voltage issues.