Wednesday, March 12, 2014

Tappan Oven No Heat Not The Igniters



Greetings,
My oven would not heat yesterday. After reading around online it seems that the most probable cause is the igniters. However, neither the bake burner nor the broiler work. It seems unlikely to me that both igniters would go out at the same time. They still do look hot orange. Is there a reason why they would both poop out? Or could there be a different cause?
The stove top still has gas. Is there a separate gas valve that feeds both the baking and broiler in the oven that could fail?
Any help would be appreciated,
Thanks.
Nate

Hello Nate and Welcome to the Do It Yourself Web Site and the Gas Appliances topic.
Agree. Not likely both HSI's (Hot Surface Igniter's) would fail at the same time. A simple test would be to turn oven burner on and wait until HSI glows what you assume to be it's brightest. Then tap burner tube with back end (handle) of a screw driver. If burner lights up, HSI is weak even though it glows bright orange. Should be a bright yellow/orange and not just orange in color. Same applies to broiler burner. Weak HSi's in both oven and broiler. Possible but not likely unless both used about equally or both igniter's more then two-three years old and both used plenty of times.
Another possible cause is the control panel. If the control panel has knobs likely the igniter's. If control panel is a touch button panel then touch pad or pads may be defective or the main control board, etc. Can't be sure since you did not mention anything in this regard. Photos would say a thousand words and a model number may be helpful also.
Isolation gas shut off valves may be on gas flow aluminum tubes. Not likely one or both have been turned off unless done accidentally during a cleaning in the area where one or both may be. You'll have to due a visual check and see. If no cleaning done they would still be on.
Retail parts dealers and appliances parts stores can also help determine what the possible problem may be based upon that specific brand and model. Bring the make, model and serial numbers. Dealers and appliances parts stores are listed in the phone book.
Read The Sticky Advice And Information Note In This Topic: Range-Stove-Oven-Broiler Basic Help Information Manufacturers Web Sites. http://forum.doityourself.com/showthread.php?t=159808
Use the reply button to add additional information or questions. Using the reply button keeps or moves the topic back up to the top of the list automatically and keeps all communications on this subject in this thread.

Dear Sharp Advice,
Thank you for your reply.
Here is the model # and pictures: 30-3857-00 / 04168-87258858
I know you cant really tell from the pic but to me I would call the igniter a yellowy orange. I tried tapping (what I believe to be) the burner tube to no avail.
The oven is controlled by knobs. And my first thought was it some how got stuck on Time bake but the igniters do turn on so this can't be it.
No cleaning or moving was done behind the stove. It had been working 2 days prior.

Hello: Nate
Based only on what the photo shows, there is only one burner used for both baking and broiling. Not two separate compartments with two separator burners and igniter's. I could be wrong. Can't see entire front of stove. Likely an oven door and beneath that a broiler drawer.
Photo appears to be taken from outside facing upward at broiler burner???? Or down toward oven burner??? What I am looking for is the flame spreader plate. Which would be attached to the top of burner on the center threaded stud facing upward. I don't see it. You likely removed it already before taking photos or is it missing???
What a service tech usually does is replace both gas control valve and igniter as a matched set if and since there is power to igniter. You might have to do that also.
Kindly advise how photos where taken and what they show. Based upon memory only the stove is a basic model with a single burner oven/broiler combo.

I'm sorry my photos are not complete.
The oven has both a bottom oven burner (What is shown in photo 2 and 3) and a top broiler (not shown). The pictures are after the the plate had been removed by me to see the igniter. The tube down the center (burner tube?) is what I tapped to see if it would light.
I can add more photos of the rest of the oven tonight.
Thanks.

Here are some more oven photos. Sorry they are dark.
This shows top broiler and bottom burner. Again the plate has been removed.
This shows top broiler.
Here is below the oven. This seems to be where the gas is split between the broiler and the bake burner.
My other thought was are the igniters tied together in away that if one goes the other will to? Kind of like car blinkers.
Thanks,

In my opinion and what we use to due in instances like these, is allows be sure there is gas going into the control valve. (Bottom Photo) How we did that was to follow the gas supply tube from the dual gas control valve up to the gas manifold under stove top.
Lift the top burner lid and look for that aluminum gas supply tube going to oven/broiler gas valve. At the beginning of that tube will be or should be a tiny shut off lever. Be sure it faces the same way as the tube and not across it. Might have been some how turned off accidentally. If so, that would account for the no gas to both oven and broiler burners.
If valve is on, you can check for gas flow at control valve by slightly loosening the inlet tube nut. However, this trick is not recommended for do it yourself repair persons. If you attempt this be very careful. That nut needs a backup wrench to hold control in place so only the nut turns slightly and you can hear gas escaping. Re-tighten and soap nut to insure no gas leaks! A MUST DO safety check.
If gas is present with shut off valve in the on position and neither burner works, very likely the gas control valve is defective since both Hot Surface Igniter's (HSI's) are glowing. BTW: Replacing that control valve is some what difficult due to it's location and position. Be aware of that gas supply tube nut likely to be difficult to initially hand thread in too.






Tags: oven, heat, igniters, control valve, oven broiler, burner tube, control panel, oven burner, supply tube, appliances parts