Intertherm e1eh-o17ha blower not working

[Bundy]

I replaced the blower motor,now the blower only works if the a/c is off and turn the switch to on instead of auto,or if I unplug the connector directly behind the switch.Thanks in advance for your help

[Bundy]

The blower would only work if the blue was hooked to the on-auto switch.Now the new motor has locked up.The blower relay has 4 wires from the t-stat, could this be the problem?Thanks in advance

[Robert]

Hi,

On-Auto switch at t-stat or front of a/c control box in furnace ?

In cooling mode and fan on continuous mode, the fan relay controls the blower on a call from t-stat.


In heating mode, the sequencer controls the blower on a call from t-stat.


Thanks,
Robert