Question about Frymaster Dean MJ35 Deep Fryer

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Commercial Deep fryer pilot light switches off when approx 180cel is reached

Hi, I have a 1.8 year old commercial deep fryer playing up. It is a Frymaster MJ35 ( model no. PMJ135GSD ). I light the pilot in the morning as usual, then turn it to on. The fryer automatically is set to heat up to approx 150celc and then switches on and off to hold it on standby when ready, pilot light stays on always. However the problem starts when I turn the thermo to 180celc to heat it up. It lights up but when it reaches a certain temperature I hear a click and the gas above switches off along with the pilot light. I had a technician man come out he said it was the hi-limit thermo which I have had replaced and it is still doing the same thing. Could it be the thermocouple, if yes why? Pilot thermo? Could the new HiLimit be faulty? I need this fixed for my cafe to continue operating as usual. Im in Australia. I ordered my hilimit from USA. Thank you in advance fir all your help. If you know the part nuber i require to order please specify. Cheers rom Australia.

Posted by Dino on

  • 1 more comment 
  • Dino May 31, 2012

    The thermostats bulbs inside the fryer are clean and unobstructed. As mentioned the fryer is not very old at all, the pilot light area seems very clean. The wires all seem to be separated no grounding issues that I or the technician could see. The thermostat switch automatically sits on 150c heats up and the pilot remains on, but then when weturn it to 180c to cooksome fries it heas then shuts the flame and pilot off. Yes, it sounds like the hi limit, but it has been replaced with new. If it was the switch thermostat why does it heat to the 150c then switch off but pilot stays on and then it switches the flame back on to maintain heat at 150c? Confusion......

  • Dino Jun 01, 2012

    I just had a technician in who did all the voltage tests and more. The thermostat was out by over 75deg celc! Hence why the hilimit thermo was shutting the fryer off for safety reasons. So the original tech guessed and tried charging over $500aud for just the hilimit part, i imported it for less than $80aud with install instructs and more. The new tech said I installed it perfectly but that it was not the problem. So he adjusted the thermostat back about 75degcel and now is all ok. Dont trust every tech, most are decent humans some are aliens trying hard to abduct your hard earned money. Do your research, ask many questions and watch their detection efforts closely. The new tech explained everything he did step by step and why, showing all results, possibly faults and next step. I must have had a hard problem, because no one replied. Goog luck to all.

  • Dino Jun 14, 2012

    Thanks anyway guys, but I hope the above description can help someone in the future. By the way I just replaced my sandwich press thermostat also....1 month out if Warranty...aaahhhhh! Lucky to find replacement thermo at good price & I installed same day, all good now. So if ur sandwich press starts glowing red & smoking from overheating....your thermostat has cooked it & needs replacing. Take care peoples.



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Paul Carew

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The second guy is spot on this page on fixya has not been working first time i have seen the problem .

Posted on Jun 14, 2012


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SOURCE: hobart deep fryer, light pilot heats to temp then all goes out?

it probibly a millivolt system, would reccomend replacing thermocouple, that should take care of the problem

Posted on Jan 13, 2010



  • 1711 Answers

SOURCE: I have a cecilware gas

The thought to replace the thermocouple is correct with indiction that the pilot light would not stay on. First we believe that the pilot flame were large enogh to cover thermocouple end. Moreover the thermocouples are only produce mlvolts to act the elctrovalve on the gas valve thus stay on. So is not un easy job cut and connect their wires since the milvolts proced will not transfered to the valve due to losses at the conection point. Moreoever the Thermocouple in your case is a special one wich is actaly cut in one point so to connect the high limit thermostat but the conection point is factory cut and asseble for the above mention reasons. however we have try the solution you have decribe to cut and connect the thermocouple some times and we found out that if we use a very good soldering conection it is work but if you make it not so carefull it does not.
So you should try to reconect the wires of the limit switch first and then go on to remoev th old thermocouple.

Posted on Aug 12, 2011

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