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Amana ASH13 heat pump - 4-wire vs. 5-wire
I am troubleshooting my heat pump system as it is running constantly thus costing a LOT more (i.e. double!) compared to our neighbours' homes of similar sizes with the same heat pump equipment. Ours is a 1 yr old home, 2700 sq ft [not including (heated) crawl space basement], 2 levels, family of 3. Heat pump = Amana ASH130361; Air handler = Goodman ARUF364216 (with Goodman HKR-20CB 20KW heater kit); Thermostat = White-Rodgers 1F89-211. HVAC contractor is unsure of cause so he replaced t-stat (with same model) thinking that may solve problem. It hasn't & with it being the Holidays they are closed.
There are 2 concerns I have since identified:
1. W2 wire (white) @ heat pump is not connected to anything, &
2. Comfort Alert diagnostics module is indicating yellow "alert" flash code 7 (= open run circuit).
Reviewing the equipment's installation manuals it appears that the heat pump connection should be 5-wire (for C, W2, O, Y, R). Our system, however, is connected via 4-wire (no W2).
Could the heat pump's disconnected W2 be contributing to these &/or other system problems (i.e. frequent &/or long defrost cycles, high electricity usage, non-staged heat strips, undersized, etc.)?
Thank you. Dogstar.