Carrier 8000TS -Thermostat works, fan comes on, hot surface ignitor does not turn on (but it is in working condition- had it checked out).

Turn power off to unit. Open air handler and take a picture of the low voltage (tstat) wires and where they are landed. Remove all thermostat wires from control board. Then replace the 5 amp fuse that is likely on the board. Fuse likely looks like one for a car (blade style). Put a jumper (small piece of wire) from the R terminal to the G terminal and turn power back on to unit. This should bring on the indoor blower. Let me know how that goes!!

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If you suspect its the ignitor? The hot surface ignitor is powered by 120v. Inspect ignitors' hot surface for cracks or burnt spots. Uplug ignitor from board. Cycle heat on and verify 120v to the ignitor at the cannon plug on the board where the ignitor plugs in. If you have the voltage then replace the ignitor. If not, you'll need to verify all other circuits are working before condemning the board. Work safe and at your own risk! Hope this helps!

The reset button should be a small round red button that you just push in to reset. If the induced draft motor comes on as soon as thermostat calls for heat then the next thing to check is the ignitor. It may be a hot surface or spark ignitor.It should glow or spark depending on the type,and you should be able to see it clearly. The ignitor should be located by pilot assembly right beside burners. If the ignitor does not work the furnace willnot procede in lighting sequence. If ignitor is not working then it must be replaced. Usually this is pretty easy if you can get repair parts.Remove screw holding ignitor in place and disconnect wires. Install new one and try it. Good luck. Thanks

Are you saying that main burner is coming on or pilot /hot surface ignitor or spark ignitor ? If your induced draft motor is coming on then a few seconds later your main burner is coming on for 3 seconds and then shutting off but blower motor is not coming on I would look at flame sensor to make sure it is telling the fan motor to come on. Normally they will try three or four times and then lock out. One easy way to check blower motor is to set your thermostat to fan on. Fan motor should come on and run till you shut it off.hope this help you.

Hi, this unit if you say hot surface ignitor has no standing pilot for you to light. Yes, the fan will run in the on position. Turn it back to auto. Leave it off. You will need 2 people, this will be easier for you. Go to the furnace and see if you have a round inspection hole to look through. If so, see if you see a red led light. Yes or know. Remove the panel to where you can see the circuit board, burners lined up and so on. Some units have a panel switch on them so when you remove the panel, it kills power to everything. It would be around the perimeter and you will need to tape it down real good. Now, have someone turn the thermostat to auto/heat and turn the heat up high. I know this is a Carrier with a hot surface ignitor, so you should be hearing the small inducer motor start running. If you did have a red led light and it is flashing, you will have a code sheet glued to the panel, a error sheet to tell you what is wrong, like if its flashing 3 times fast and 1 time long and slow you would look at chart and it will say what to look for. Some units have them and some don't.Anyway, the inducer motor comes on first, it has a clear plastic tube coming from it going to a pressure switch. If the motor is on and the tube is clean, no water, condensation in it, it goes to the switch and closes the switch.When it closes, it will send a command to the main controller, circuit board or a module to send power to the hot surface ignitor, which will glow and send a signal back to open the pilot valve(PV). There is a porcelin flame sensor next to the ignitor that has a metal tip which heats up and tells the main gas valve the pilot is on to open up and send gas from the 1st burner over to the 2nd and so on. This is the sequence of operation. We know the stat is good, and the blower motor is also good, so all we need to do is find out why the furnace wont light and run. It may have a flame roll out switch on it that has tripped. It has a reset button on it. Make sure the gas valve and gas is on before you do this test I am walking you through. Try to have a helper. Remember the door switch if it has one. This should be a easy fix, so get back to me and keep me posted on what is going on. I will wait to hear from you. You can do this.
The best to you,
Shastalaker7

if this is a high effeciency model, the venting may not be clear or the drain may be partially plugged. if you hear any sort of water gurgling in the inducer motor, you probably have one of these conditions. if that checks, see if you have 110 volts to the hot surface ignitor. if you read voltage there after the inducer comes up to speed, then you need a new hot surface ignitor. if no voltage, then the pressure switch is still not closing. concentrate on the condensate drain and furnace venting.

The fearute that is running your fan so often is designed to provide even, consistent temperatures throughout your home as opposed to hot spots and cold spots. Some customers find this feature to be an annoyance or a waste of electricity. IF you would like to be able to turn off that blower you can have it wired to a switch which would give you either manual off and on or even a timer.

If you want to do this in a barebones fashion you cojuld just find the circuit breaker that controls it and turn it off when you don't want to use any function of air, heat or cool.

If your fan selector, NOT SYSTEM SELECTOR, is in the auto position then your fan motor module is likely bad.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

If you can see any sign of a crack in the coil (Hot Surface Ignitor/HSI) it is probably bad.
If the inducer fan starts (the small fan) and you don't see the ignitor glow, it is almost definitely the ignitor.
Hope this helps
Matt

turn off power to furnace and open the front panel and see if you can see burners and gas valve and Hot surface ignitor.
If you can. turn furnace on and watch to see if the ignitor glows.
Let me know what you find. If it doesn't glow you probably have a faulty Hot surface ignitor.
If I had make and model number I should be able to find the part