View Full Version : Would a bad transformer prevent blower from working?
sampsonsix
Dec 5, 2007, 06:41 AM
Furnace turns on but blower will not work. I was told it is the transformer. Could it be and what does it do?
Stratmando
Dec 5, 2007, 07:05 AM
The transformer provides power to relays or contactors, to engage the Big power(blower). That way thermostat does not need very large wires. (relatively speaking)
labman
Dec 5, 2007, 08:55 AM
A bad transformer and nothing happens except some furnaces default to the blower running.
Go to the sticky at https://www.askmehelpdesk.com/heating-air-conditioning/heating-cooling-maintenance-repair-troubleshooting-frequently-asked-questions-58313.html
Follow the sequence of operations and see where it stops. Try to figure out the code is it has a red blinking light.
Stratmando
Dec 5, 2007, 09:16 AM
Likely who told you it was bad, measured primary voltage in, voltage was present, and there was no low voltage out. Less than $20 part.
Primary, and secondary voltages need to match existing. And the Volt/Amp rating should match or exceed existing transformer.