Question about Honeywell HZ-709 Oil Filled Radiator Heater

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Heater When I turn on my unit it shows an "F" and the unit turns off. Does anyone know what that might mean or how to help me to get it working. Thanks Sheryl Ann

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  • Anonymous Nov 05, 2007

    The problem I have is that when I turn the unit on, the display shows an 'F' and then it immediately shuts off. The first winter we had it, it worked fine. The problem started in its second year of use. It would work for a time but then shut off. And now coming into this third winter, it won't work at all. I've searched files for an operator's manual but can't locate it. Does anyone know where I can find one on line? It was a gift and I also don't have a record of the warranty mailing - that I usually do - but can't locate on this one. Francie

  • sdbeag Dec 19, 2007

    I have the exact same issue! After switching it on I hold down the middle button and after a few goes (with it switching itself off a few times) with me still holding down that center button when I switch it on, a number comes up (presumably a temperature) and the heater works for a while.

    It requires far more patience than I have. The design is seriously flawed. And I have no idea how to soulder wires together myself like the person who responded to your message before. Good for him! Just my luck, I no longer have the receipt. I will never buy a honeywell again! Thanks for posting.

  • sayedz Mar 25, 2008

    Problem: firs let's identify the problem, there is a sensor on the inside panel, made originally for safety if you tipped the heater off, it kill the power causing it to turn off...after a year of so that sensor get a little rusty/dirty causing it not to work correctly...

    let's find out how to fix that annoying turn off..

    tool needed, a phillip screw driver.. electrical tape or soldering unit..

    fixing it: take out the top and bottom screws, to open the panel. after you open the panel you'll see a metal bar screwed to the front controller...take all 6 screws out...the front panel comes off....then there is about 4 screws holding an inner box, open that up..

    inside there, you;ll see lots of wires...look for 2 small blue wire running together to a black sensor that make noise everytime you move it....

    disabling the sensor


    2 ways you can do this..

    -you can cut the wire off using a scissor, and connect the blue wires together, use the tape to tape them.


    - you can solder them together on the back of sensor panel...

    there you go problem solved...



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I had the exact same problem with the HZ-710 - it has the same controls and design. The manufacturer (KAZ) indicates on their website that there are no parts available for these heaters - I suspect that it is cheaper to replace these inexpensive heaters than to have it fixed. There sevice phone is 800-477-0457
or email:

I discovered that my heater had a defective auto-shutoff sensor - there's two sensors that are wired in tandom - both need to have a connection to complete the circuit - I'm not sure if it was the sensors or the incredibly sloppy wire connection that was causing the problem - I disconnected the sensors and permanently soldered the wire connection myself. The unit works fine now.
Even though I voided the warranty - to me it was worth it not to hassle with any (non) customer service - for I suspect they would send me a note that stated the following - "At KAZ we pride ourselves in quality manufacturing and are sorry for any incovenience that you may have.blah, blah, blah, blah, blahhhhh, bla-bla-bla, buuuhlaaaa, blah, blah, blah, um, blah, blah, blahhhhh, b-b-b-b-lah, la, la, blah!

Posted on Dec 09, 2007

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Thank you, thank you sayedz! We took my heater apart, somewhat like what you said - got enough from your post to figure it out, eliminated the bad tip-over sensor and now my heater is working! I'm so happy and WARM. We just used the tape version. I don't have children in the home, just pets, but I only use this heater in my office during the hours that I'm in there, so I don't think I'll have any safety concerns with not having that sensor intact.

I really appreciate you taking the time to explain how to fix it.

Posted on Nov 17, 2008


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