Mach 15 A/C Fans Intermittent - Fixed - Printable Version
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+--- Thread: Mach 15 A/C Fans Intermittent - Fixed (/showthread.php?tid=8942)
Mach 15 A/C Fans Intermittent - Fixed - hypoxia - 05-01-2026
Number 1 & 3 rooftop A/C unit fans would start-stop-start-stop-start & run. Both units started doing that on the same day. I checked the fan capacitors, they were out of tolerance. Then I found an intermittent start capacitor and a run capacitor out of tolerance. I ended up replacing all four A/C units fan (7.5uf) and run (40uf) capacitors and replaced the 4 start capacitors & PTCR's with Supco SPP6 . Then I cleaned the evaporator coils and condenser coils. I checked the compressor terminals, they were good, it's not uncommon to find an overheated terminal on the compressor. I move the terminal back & forth to ensure a good connection. I spent wo days on that project, hopefully it cured the intermittent fan problem.
RE: Mach 15 A/C Fans Intermittent - Fixed - encantotom - 05-01-2026
hi jim, do you have soft starts on them?
tom
RE: Mach 15 A/C Fans Intermittent - Fixed - hypoxia - 05-01-2026
(05-01-2026, 08:57 AM)encantotom Wrote: hi jim, do you have soft starts on them?No. Here's a photo of the intermittent capacitor.
tom
RE: Mach 15 A/C Fans Intermittent - Fixed - [email protected] - 05-01-2026
I have those SPP6's on all four of my SCS compressors. Helps keep from slamming the generator with a big load when the compressors kick on. I keep a couple spares as well.