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IF THIS IS NOT A HEAT PUMP SYSTEM... COULD BE;

thermostat connecting(calling for) heat and cool together.

connnection problem in wires- or bad thermostat.

find wiring diagram for t-stat, read up on checking voltage in thermostat in the heat-or cool mode. they are separate. does t-stat have separate 'heat-cool' mode. in other words- do you have to switch to heat mode-or cool mode. if it is a heat pump--ask again with that stated in question.

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Q: What would cause a home air conditioner and heater to run at the same time when turning on the heater?
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