Furnace runs but will not ignite
Our furnace started this last night. It will come on and do the blow out thing and then you can hear it click to ignite but it doesn't ignite. After 3 attempts it turns off. Any suggestions?
Forum Discussion
btd35 wrote:
If you are hearing it click to ignite, then it is not the sail switch as the switch locks out the ignition and you will not hear a click. Most likely problem is the ignitor itself, the gas valve coil, or your gas supply has a problem.
Correct......sail switch has to make up otherwise no power to control board for ignitor.
Ignitor is clicking so there is power to board.....and to gas valve (power goes to both at same time)
3 attempts to light off and prove flame then lock-put.
Sounds like it just isn't getting gas.
Turn on stove top burners (high---all of them) and check how the flame looks on them. Are they all the same....strong blue flame/same height?
Then retry furnace again....gas flow may have failed during night (frozen reg./empty tank etc.)
Verify to have propane flow before tearing into furnace.
Good stove top burners and furnace still locking out (after a couple of attempts by resetting t-stat).
Then you will need to dig into furnace and check for voltage at gas valve (during ignition trail), check for gas orifice blockage/burner blockage etc.
Post back......
