Air handler not switching from heat to cool via /r/DIY


Air handler not switching from heat to cool

Hello, dumb homeowner here. I installed a new downstairs thermostat a few months ago since it went out. So far, the heat has been working fine and I haven’t had any issues. Tried switching to cool and the thermostat clicks and changes to cool setting, however my air handler stays on heat for the downstairs zone.

A couple more details. I have a wireless(?) thermostat upstairs that switches the air handler for it’s zone. Also an HVAC tech came and bypassed my heat pump high pressure switch since it was bad as well.

Here’s some photos of the wiring.

handler thermostat

Submitted March 27, 2021 at 07:01AM by Joetech90
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