Heating Help

oil furnace not firing

when i turn the hot water on the furnace fires but not when i turn the heat on. any idea what could be causing this?

Not firing

Is the house cold but eed more informatione on the system. Taco zone valves take up to 2 1/2 minutes to open and start the burner and start the circulator.  

Control side

If the aquastat is firing it on low limit. You need to look at the control side. Is the thermostat calling for heat? Is the T-stat in heat mode? Are there zone valves? If so are the end switches closing. Is there a zone control? Is there a separate burner relay? Is there a separate transformer for the control system? Is it fused? If you have zone valves, do they have led lights? If so are they lit indicating you have 25 volts to them? Is the light indicating a call for heat. Is there power to your circulator? indicating everything else is working but the circulator is nor moving the water.

Control side

If the aquastat is firing it on low limit. You need to look at the control side. Is the thermostat calling for heat? Is the T-stat in heat mode? Are there zone valves? If so are the end switches closing. Is there a zone control? Is there a separate burner relay? Is there a separate transformer for the control system? Is it fused? If you have zone valves, do they have led lights? If so are they lit indicating you have 25 volts to them? Is the light indicating a call for heat. Is there power to your circulator? indicating everything else is working but the circulator is nor moving the water.

do you have heat?

Is the burner off on safety?