I have a two zone system. All of a sudden, both zones, whether they are on simultaneously or independently, are only heating the upstairs. Nothing is blowing downstairs. This is a Carrier system. Any help is appreciated.
thx
Sounds like a zone control module problem. If it was fan/dampers, you'd have nothing blowing anywhere with only downstairs thermostat calling for heat.
You may be able to manually open the ones that you need or vise versa.
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