Frymaster HLZ that McDonalds uses
I've got a couple HLZ's that keep going into high and lock out the buttons on front, but once you unplug it and let it cool down, the buttons work just fine for another 24 hours or so. Just wondering if that's normal for happening when the computer for the HLZ's are going bad because once I change out the computer for the HLZ's the problem goes away.
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Its been a couple of years since I've worked on a hlz. But isn't there a dot on the display that indicates the plate or air heater is on? I had two mcdonalds I took care of for several years and never did replace a computer. It was always a platen or a solid state relay.
I guess my point is. When I had an hlz overheat on me. If I could catch it acting up I would always check the display first. I never saw the dot on the screen. It always seemed the solid state relay had stuck..
Hope this helps
I'v worked on a lot of frymasters before but not the HLZ! But if you change the computer and the problem goes away then my guess is the computer is bad.
If i suspected a computer problem then i would switch it with the one on the fryer next to it to test it.
They wouldn't act up in the shop but after a couple days at the store they'd acted up, so the boss said just replace the computer and the relay's.
So far I've had to replace 3 HLZ computers and relay's and it seems to solve the problem, which I find kind of wierd, cause just switching out the relay's didn't help.
Frymaster says its a air flow issue but that I can tell with the fan motor in them is just fine. Replaced one of the fan motors cause it had the same issue but it didn't solve the problem till the computer and relay's were changed out.
My bad! i was thinking fryer.
I was looking at the service manual for that unit and seen it's basiclly a holding unit.
If frymaster is saying its an airflow issue. There is a screen or filter where the air gets sucked in. Is that clean, no restrictions?
The screen is clean and not all the stores even have the screen anymore to use it. When I open it up to clean it out there isn't much food crumbs in the unit.
Originally Posted by jackintheboxtec
Last edited by caheiman30; 07-28-2012 at 11:09 AM.
Reason: forget some information
The air heat relay is known to stick on. Also clean the fan. The comp will lock out if it gets to hot and will eventually fail.
mmm, I will have to watch for that when I get one in for this issue again.
Just a quick tip. Been working onMcD stuff 11 yrs. Comp will act erraticaly if it gets too hot. SSR's won't stick but the ones in an hlz will half wave. They will pass either the high or low side of the sine wave. Can be tested when operating and temp dot is off . If meter says any thing bu ) volts AC, it's halfwaving and needs to be changed.
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Every HLZ in service I have ever taken apart was in need of cleaning. Not with food particles in it but dust and lint accumulation. Use co2 or an air compressor (not canned air) to blow it out. Unscrew the computer housing and tilt it over then blow out thoroughly under the plate, through the blower housing, and most importantly through the computer housing. The computer gets insulated with the lint in there and gets hotter than it should.
Maybe you already knew that but hopefully it helps someone.
Yes the fans could be blocked off, not enough air flow will cause that issue.
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