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gtt531 · Nov 27, 2007, 11:00 AM

Carrier Day & Night Heater Model# 394GAW000075
System was working flawlessly up until this morning. I was moving some items around in the basement and somehow managed to disconnect one of the t-stat wires, leading into the heater. After reconnecting, turning the system on simply runs the blower with no ignition fire. I replaced the t-stat; no difference. I inspected the circuit board and did not see any blade fuses or other removable fuses. The slow-blow fuse installed at the power switch is intact as well. Suggestions??

hvac1000 · Nov 27, 2007, 02:38 PM

You landed the disconnected wire on the wrong screw or post.

juggallojed · Nov 27, 2007, 07:33 PM

Possibly damaged the transformer,

Some control boards will run blower continuously when 24 volt power is dead

gtt531 · Nov 28, 2007, 11:25 AM

Thanks for the feedback. The problem was in fact the transformer. Replaced the old fella for $18 bucks and all is well.

juggallojed · Nov 28, 2007, 05:54 PM

Originally Posted by gtt531

Thanks for the feedback. The problem was in fact the transformer. Replaced the old fella for $18 bucks and all is well.

Your welcome we try,

serg_e · Apr 12, 2009, 03:03 PM

Originally Posted by juggallojed

possably damaged the transformer,

some control boards will run blower continously when 24 volt power is dead

Hi,

I have the same problem with my Carrier 58SXA060 unit. The transformer is good and there is 25 VAC on the output. Checked the relays – seem to be OK, tried the contacts – they have not got stuck. No voltage on the HFR relay (normally closed) coil.

I appreciate if you can help.