For one unit of my heating system, the fan doesn't come on when set to
AUTO. It works fine when set to ON. Replacing the thermostat didn't
solve the problem. (At first the boiler was also not coming on but this
was solved by replacing a relay.)
For my other two units, I had the same problem but worked around it by
setting a switch on the existing thermostats to ELEC instead of GAS,
even though my boiler is run with gas.
Does anyone know what the problem might be?
Does the thermostat energize the blower relay?? or does the the furnace
control board energize the blower relay?? Without the most simple, basic,
information, there is no way to tell. Can you tell whats missing??
Without this information, your wasting our time.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.