Gas and Oil Home Heating Furnaces - forced air electric furnace help needed

hi,
we have a Lennox Foreced Air Electric Furnace. It's about 30 years old. We have replaced 2 of the relays in the last year.

It seems like the furnace is sticking on and we have to turn it off at the breaker. We have a 200 amp entrance.

What happens is regardless of what temperature the house is, the furnace seems to stay on but only sometimes....today as an example, the house was 21 degrees (we have a programable digital Honeywell thermostat that was just installed a week ago in hopes that it was our old mercury thermostat that was the problem...)
So today as an example, it was keeping all the hot air in the ducts so all the furnace vents were not blowing the hot air. My husband turn the fan on manually to blow out the hot air, then the thing wouldn't turn off.

Any suggestions or ideas of what we could look at next? we've already had it re-wired last year so all the wiring is new and 2 relays.

thanks so much for any help you can offer, we know it needs replacing but just can't afford it right now.

tracey

It sounds like relay problems. There could be a wiring or setting problem with the thermostat. Make sure the thermostat is set up for electric heat.

hi Grady
thanks for your response. The thermostat is set up for electric forced air.

We will try to replace the relay's again to see if this helps.

thanks,
Tracey