I have a intertherm Central Electric furnace Model FEW-015H Voltage supply 240 volts Heating output 53,000BTUH Appliance No.F000551240.It is only throwing out warm air.It run all of the time to heat the trailer up.Before husband died it threw out hot air and took no time to warm trailer up.

You probably have a bad heat sequencer or a heating element that is defective.