Performed diagnostic Goodman gas package unit roof. Found thermostat on in heating mode furnace not working got on roof found unit no low voltage, fuse blown. Need to determine weather there’s a short in the low voltage line. Signed up on Membership. Performed the low voltage check went thru all the wires, got system to finally cycle on and found out it was also had a bad gas valve control. So when call for heat turns on gas valve it blows the fuse. Need to replace gas valve. Tried calling owner could not get thru. Left message. Decided to go get part to get tenant heat. Installed gas valve. Tenant warm and happy. Got a hold of owner,