How to go about Troubleshooting and Repairing a Hot Furnace Ignition
Furnaces come in handy for home owners especially during Winter and while they help work out miracles at times when natural heat is a luxury, proper maintenance and repair is imperative. Furnaces with electronic ignition structures deem more efficient than the earlier lot but the reason as to why is because they are highly complemented by electronics.
That means that when your furnace acts up, you are undoubtedly looking at an electronic hitch. While you neither need to be an expert to solve some of these issues arising with your furnace, here are a few DIY troubleshoots that you can try:-
The Furnace burner won’t ignite?
With Hot Surface Ignition Systems, if you hear a gas hissing sound for about 7-10 seconds and the burner won’t ignite, then the furnace will no out go into a lockout mode? To solve this problem
- Reset the furnace by switching off power then back on again. A reset button may also be located on the solid state control board.
- If resetting option fails, turn off gas and furnace power. After this, remove and check the hot surface igniter observing caution with the heat element, you shouldn’t touch it. If the igniter is cracked or damaged, consider replacing it.
Furnace Switches on for 7-10 seconds then turns off?
- Turn off furnace gas and power then remove the flame sensor from its bracket. Try cleaning he surface with fine cloth then replace.
- If this option doesn’t solve it, then the issue may lie in the PCB unit. Could be the black and white wires at the junction box are on reverse polarity. The electronic ignition control system should ensure current flow current charge through the flame sensor and to ground so if polarity is reversed in the PCB, the flame sensor fails closing the gas valve since there is no voltage potential.
- Again if the black and white cables are fitted correctly and the flame insists on dropping out, then the issue could most likely be bad ground. You can try using a volt-ohm meter, measure between the white and ground wire to ensure you have no voltage.