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Problem w/ Optimus space heater model H-4438.

I have an Optimus heater model H-4438. shortly after turning the unit on the ALARM light comes on. The unit still rotates normally but it will not conduct any heat. There dosen't seem to be any answers or trouble shooting tips in the manual. Is there a way to reset the unit & if so how? If resetting it doesn't seem to do the trick can u offer another solution? Or the next step to take in solving this cold problem. Anyadvice would be much appreciated. Thanks-a-bunch!

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  • Economist Jan 11, 2009

    I have the exact same problem and can't seem to troubleshoot. Hopefully someone can figure it out!

  • Bill6082 Feb 02, 2009

    My Optimus H-4438 was purchased at Walmart in 2007. Used it in winter only during the evening when at home. Turned it off at night. Today, Feb.2009 when I turned it on the Alarm light came on and no heat. It is cold in Kentucky. Can you help me with this problem?

  • kevynmonier Feb 23, 2009

    I have the same problem and I am looking for some advice as well!!

  • Mark Pingon Nov 10, 2013

    Anyone know why it ticks when plugged in, and lights flash once very quickly and go out. It continue to tick and nothing lights up or works?

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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 Jan 04, 2010

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2 Answers

OPTIMUS H-4438 ELECTRIC HEATER ALARM LIGHT UP NO HEAT STILL ROTATE


I took it apart found nothing. Put back together took the plastic screw driver with the unit on,gentlly tapped the plastic houding opposite of the heat senser at the top of dish and it works!

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Alarm light comes on as soon as I turn on heater, preventing heater from coming on.


You can replace this fuse with a circuit breaker from RadioShack (part # R59-15A), and then the next time it trips you can reset it, instead of having to replace the fuse, which requires soldering.

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Every time i turn on my heater, the alarm light goes off and the heater will not turn on.


I would buy another heater unless, that one is new and try to return it..

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I have a 800/1200 oscillating dish heater (optimus h-4438) i have an alarm light on it so it has stopped working. up to this point i have had no problem with it - it has been perfect. can you tell me...


Initial quality is questionable. Within a few days buying the unit the buttons stopped working. I was about to return it. I took a chance and I opened the unit and figured out the problem and fixed it buy tightening some screws and repositiong the circuit board. I am not sure how many would be inclined to do all that.

Feb 07, 2010 | Heating & Cooling

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Optimus heater h-4438


Check on the heater coil using the multi-tester. Set it at Ohms 1 x 10 position.
1. Switch it off and disconnect it .
2. Disassemble the electric heater.
3. Put the multi-tester probe (red and black) at each
end of the heater coil.
4. If the reading is almost zero, then it is okey.
Otherwise, you have to replace it.
5. Then, reassemble the electric heater.
6. Plug it back to the electric outlet, and switch on.

Nov 03, 2009 | Optimus H-4436 Electric Heater

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Optimus H-4438 Electric Heater


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

Jan 10, 2009 | Optimus H-4436 Electric Heater

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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