This is the first fall/winter in our new house. Haven't had to use the
heater until this week. I've noticed it exhibits some strange behavior...It
will run normally and shut off when the desired temp is reached. Then, the
fan comes on for a minute or two, goes off, comes on, goes off, and repeats
3 or 4 more times. It's an electric central heat/air unit. Does this sound
normal? Any ideas on the cause? TIA!
Your thermostat will turn on the heating elements. When they are hot,
another thermostat in the furnace turns on the fan, which should continue to
blow until the room thermostat is satisfied and the elements cool down.
There may be a problem with the fan thermostat for it to be cycling
There's usually a thermostatic fan switch in the furnace to 'remove' any very
hot air left behind in it after a regular heat cycle. This is what it sounds
like is happening.
Can be agravated by dirty air filters, blocked air ducts, heater strip relays
that fail to shut the heat off when they are supposed to.
This fan switch maybe adjustable in some cases, and you could try a setting more
suited to yourself.
It would be safest to have a professional service person examine the furnace and
set it up. They could look for bad relays and such, and make sure that it's
clean and there's the correct air flow through the unit.
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