How to know if my heat pump wire is the right size?
Electricians can flag heat pump wiring as undersized and flickering lights can hint at electrical issues, leaving homeowners unsure how to verify the wire size themselves. This makes it difficult to know if an existing wire is correct when handling repairs or dealing with safety inspections.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1resetting the breaker panel when units trip
- 2Treating the existing connector size as good enough
- 3Using a spade connector
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
r/AskMechanics1 person · September 2026
“Broke the wire on the A terminal. Got a new connected but how do I make sure the old wire is the right size?”source ↗
PlentyCommission5771 · r/AskMechanics · 1 upvotes