### Handling Result:
Replacing the same type of capacitor C1 resolved the fault.
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### Midea Air Conditioner Problem:
After being powered on, the air conditioner cools normally but does not heat.
#### Analysis and Maintenance:
For this model, the heating and cooling functions are controlled not only by the working mode control relays J3 and J4, but also by the temperature control relay J1. Under normal circumstances, when J1 is energized, the normally open contact J1-2, which is in series with the cooling control relay KA4, closes, while the normally closed contact J1-1, which is in series with the heating control relay KA3, opens. Preliminary diagnosis suggests that the contacts of J1 are stuck. Using a multimeter's ohm setting to measure J1-2 revealed an open circuit state even when the device was turned off.
#### Fault Phenomenon:
After powering on, the air conditioner cools normally but does not heat. (Midea Beijing Air Conditioner After-sales Service Hotline).
#### Data Source:
Midea Beijing Air Conditioner After-sales Service Phone Number - [http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3760772](http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3760772)
The transistor BG8 in the temperature control circuit that drives J1 is driven by the comparator IC7b. Measurements showed that the voltage at the inverting input terminal of IC7b relative to ground was 2.2V, while the voltage at the non-inverting input terminal relative to ground was 1.9V. Disconnecting the RT connector plug did not resolve the issue, leading to suspicion of a faulty capacitor C1 connected between the inverting input terminal and ground. Upon disassembly and inspection, it was found that C1 had leakage.