Jump to content



Learn appliance repair at the Samurai Tech Academy.  Learn more.  Earn more.


Parts Search
Site Search

FAQs | Store | Memberships | Repair Videos | Academy | Newsletter | Beer Fund | Contact


Welcome to Appliantology.org, the Web's Premiere Appliance Repair Resource!

The world-famous Samurai Appliance Repair Forums


To get started, click here.


Already a member of the Appliantology Academy? Just sign in with your username and password in the upper right-hand corner of the screen.

 


Photo

Thermador Simmer burner: bad solenoid or potentiometer


  • Please log in to reply
9 replies to this topic

#1 joatmon

joatmon

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 31 January 2011 - 11:32 AM

I have a Thermador duel fuel 6 burner range & stove (PRDS366US).
One of the Star Simmer burns wasn't working at all. It sparked but there was no click of the gas solenoid and no gas hissing.

I took it apart and it magically started working so I just cleaned things up and put it back together.
Then after a while it started working intermittently.

I.e., sometimes the solenoid clicks on, the gas hisses, it sparks and it lights but sometimes it just sparks without the solenoid clicking open or the gas hissing.

On the XLO simmer setting, I can see that the time delay still works before it starts sparking, so I would think that means the potentiometer is working (since presumably that controls the delay and triggers the spark after a given delay) but that the solenoid is broken. I.e., I am guessing that the potentiometer controls a timing circuit that triggers the solenoid to open/close and the spark ignitor to trigger after a variable amount of time. And since the sparking is still responding to the variable timing, I am assuming that part of the circuitry is OK.

- Am I understanding the working of the electronics properly?
- If so am I correct in thinking that the fuel solenoid is the most likely culprit?
- Given that the problem is *intermittent* is it likely that the solenoid is broken (needing replacement) or is it more likely a bad/corroded connection?
- Any suggestions on how to troubleshoot?

Thanks

Use the Appliantology Parts Search Box to Find What You Need!
Enter your model number, part number, type of appliance, brand, or even a part description.
365-day return policy on all parts purchased here, even electrical parts that have been installed!

#2 joatmon

joatmon

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 31 January 2011 - 11:35 AM

One more clarification. The other simmer unit works just fine...

#3 joatmon

joatmon

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 02 February 2011 - 12:39 PM

Well no replies but I am now pretty convinced that it is the solenoid valve. As a test, I switched the wires which resulted in the symptoms switching to the other knob - meaning that the potentiometer and other parts of the simmer control unit work and thus in my mind conclusively isolating the problem to the solenoid valve. I have ordered a new valve which should arrive tomorrow.

#4 Samurai Appliance Repair Man

Samurai Appliance Repair Man

    Shōgun

  • Master Samurai Tech
  • 29,636 posts
  • Location: USA
  • Flavorite Brew:Sapporo Original Draft Rice Lager

Posted 02 February 2011 - 03:32 PM

Nice shootin'! Those solenoid valves are common troublemakers. An easy way to check them is to measure the resistance of the coil at the terminals. With your meter on the Rx10 K scale you should get about 1760 ohms.

#5 joatmon

joatmon

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 02 February 2011 - 03:53 PM

Yes - I forgot to mention that I also put my digital multimeter on it and found an open circuit across the presumably broken solenoid and I got a similar reading to the normal one you quote on the working solenoid valve

#6 Samurai Appliance Repair Man

Samurai Appliance Repair Man

    Shōgun

  • Master Samurai Tech
  • 29,636 posts
  • Location: USA
  • Flavorite Brew:Sapporo Original Draft Rice Lager

Posted 02 February 2011 - 04:15 PM

Meter on the Rx10K scale?

Edited by Samurai Appliance Repair Man, 02 February 2011 - 04:33 PM.
Rx10K scale, not Rx10!


#7 RegUS_PatOff

RegUS_PatOff

    Sensei

  • Academy Instructor
  • PipPipPipPipPip
  • 33,588 posts
  • Location: USA
  • Flavorite Brew:Chief NTSC Black & White

Posted 02 February 2011 - 04:32 PM

digital multimeter

on the 2k (2000) OHM scale
.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#8 joatmon

joatmon

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 02 February 2011 - 05:21 PM

I used the 2K scale and it was about 1.7Kohm

#9 RegUS_PatOff

RegUS_PatOff

    Sensei

  • Academy Instructor
  • PipPipPipPipPip
  • 33,588 posts
  • Location: USA
  • Flavorite Brew:Chief NTSC Black & White

Posted 02 February 2011 - 06:18 PM

- Any suggestions on how to troubleshoot?

For manuals and lots of other goodies,
become an Apprentice==> http://appliantology.org/apprentice/

was about 1.7Kohm

that's correct
.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#10 Samurai Appliance Repair Man

Samurai Appliance Repair Man

    Shōgun

  • Master Samurai Tech
  • 29,636 posts
  • Location: USA
  • Flavorite Brew:Sapporo Original Draft Rice Lager

Posted 02 February 2011 - 06:20 PM

Sounds like you done nailed it, Hoss. :smokin:




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users


FAQs | Store | Memberships | Repair Videos | Academy | Newsletter | Beer Fund | Contact


Use the Appliantology Parts Finder to Get What You Need!
Enter a model number, part number, type of appliance, brand, or even a part description.
365-day return policy on all parts purchased here, even electrical parts that have been installed!

Your Sometimes-Lucid Host:
Samurai Appliance Repair Man
"If I can't help you fix your appliance and make you 100% satisfied, I will come to your home and slice open my belly,
spilling my steaming entrails onto your floor."


The Appliance Guru | Master Samurai Tech

Real Time Analytics