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- Sat Feb 11, 2012 6:32 pm
- Forum: Help and Advice
- Topic: UZC4--Fan is running but compressor will not start
- Replies: 1
- Views: 4462
UZC4--Fan is running but compressor will not start
I have a problem with a geothermal system using the UZC4 with three zones and two stages. Occasionally, in "Heat" mode only (this never happens in "Cool" mode), the thermostats will call for heat but the compressors will not start. The fan will be running constantly (even though set to "Auto") when ...