I have a honeywell thermostat (really old one) and looks like the furnace does not get the signal when to turn on. Is there a way to by pass the thermostat so I can manually turn the furnace on (force the thermostat to send the on signal for the heater) while I look for the replacement?

I have a honeywell CT3500A4453 - 0150 model (I think)

Thanks.