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Optimus H5300 heater won't turn on

Heater won't even power up. Have tried to reset tip over switch but nothing. Can't find a fuse to replace. Help! It's -2 outside

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  • 17 Answers

How old is it and has it had lots of continual use?
If it's old and you've used it a lot I'd suspect corroded wires. I've fixed many of these all with the same problem. The wires corrode to the point where they just fall away from where they were attached. I've seen switches get brittle and break apart and thermostats go bad.
Take the cover off a look at the ends of each wire. I just replace them when the ends don't look so good. Make sure you use the same gauge or thicker wires with high-temp insulation.
Newer heaters usually have fuses so look anywhere you haven't looked before where there is a power wire.

Posted on Jan 07, 2014

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Posted on Jan 02, 2017

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Buffalo12980
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SOURCE: Cadet heater quite working

that round metal thing is called a klixon overload. look on the side of it and an amperage range should be there. replace the unit and the element should work unless the element itself is blown. check for continuity across the element with your meter with the wires disconnected.

Posted on Nov 04, 2007

hotuna
  • 288 Answers

SOURCE: heater won't come on when temp drops...must reset limit switch every time.

The limit switch is shutting off and you are having to press the re-set button, right? The limit switch, if I am understanding you correctly, is the thermal disc type, may be ok, but what is causing it to shut off? I would first, not put total faith in the serviceman (PG&E maybe) and replace the limit switch. Its only a few bucks,and easy to do. Then if its still the same problem, look into the venting pipe. As it may not be adequate for the heater. Espically if its new. These new wall furnaces are kind of touchy. It may be larger, BTU wise, and the vent pipe may need to be enlarged. If this is a big job, and a bit too impractical, check the vent pipe, make sure its in good conditon, no leaks ect. install a cO2 detector and by-pass the limit switch.

Posted on Jan 07, 2008

  • 1 Answer

SOURCE: Alarm light staying on.

I have the same problem. I removed the center panel on the back of the dish and found a fuse inside a white insulating sleeve. The fuse is open, preventing the current from reaching the heating coils. On the fuse it says 121 C. and 15 A.; I assume that it is designed to blow if the temp. of the dish exceeds 121 centigrade or the current exceeds 15 Amps. I don't see any reason to believe that either has happened so I suspect that these fuses just spontaneously fail. Now I just need to find a source for new ones. I wouldn't recommend jumping the fuse as it could lead to a fire.

Posted on Sep 05, 2008

  • 22 Answers

SOURCE: Laars lite 2 LG or LD Pool Heater- Heater won't stay on

the control module is the problem it allows the heater to come on then turns off power to the gas valve.if you are not getting enough water flow the high limit is turning the heater off then your problem is flow.

Posted on Feb 19, 2009

  • 1 Answer

SOURCE: Optimus H-4438 Electric Heater

On the back of the heater, remove the element connection cover ( 3 philips screws). A white wire from terminal goes into a white sleeve and turns in to red wire. Under this sleeve is a special fuse, TCO (Thermo Cutoff) that has that has blown.SEFUSE, SF110Y, 15a

Posted on Nov 27, 2009

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1 Answer

My optimus want come on.model # H5300 BK


Internal fuse is probably blown. Are you able to use a multimeter?
You need to disconnect from mains and check continuity through the thermostat and fuse.

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shake it and see if the tilt switch resets. >>replace anti tilt switch

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there is what is a called a tip switch some of them have to be manually reset.
If not then the tip over switch is stuck rock it back and forth or gently shake it ans see if it will go back to safe position

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It may be the remote control. Have you tried operating the heater without the remote? If you haven't give it a try. This will tell you if the problem is with the remote of not. If works without using the remote, the remote may need new, fresh batteries. If that doesn't solve the problem, turn OFF the Master Switch on the heater to OFF. Unplug the heater and wait 12 to 15 minutes before plugging it back in.
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Optimus electric heater can be found on amazon, click here and take a look: Amazon com optimus electric heater. I hope this was helpful. Cheers

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4 Answers

Alarm light staying on.


I have the same problem. I removed the center panel on the back of the dish and found a fuse inside a white insulating sleeve. The fuse is open, preventing the current from reaching the heating coils. On the fuse it says 121 C. and 15 A.; I assume that it is designed to blow if the temp. of the dish exceeds 121 centigrade or the current exceeds 15 Amps. I don't see any reason to believe that either has happened so I suspect that these fuses just spontaneously fail. Now I just need to find a source for new ones. I wouldn't recommend jumping the fuse as it could lead to a fire.

Feb 22, 2008 | Heating & Cooling

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