20 Most Recent Honeywell HZ-709 Oil Filled Radiator Heater Questions & Answers

Where can I purchase the on / off switch for model NYP 7043-5837-8

When switched on power is supplied to the heating element until the temperature reaches that which the thermostat is adjusted to and then the thermostat switches off the power to the element. Whether electro-mechanical or electronic the thermostat isn't doing the job and as it is a digital control electronic thermostat that seems dead, I guess that is the part that needs repair or replacement.

Try swapping the fuse in the plug, If not that I would contact seller and or manufacturer for replacement / repair under warrenty.

I'm going to ask the first "obvious" question: are you sure the socket you're plugging into is delivering power? (Sorry to ask but it's an Occam's Razor kind of situation) Have you tried a different socket in the same room? Next, does the main power switch for the heater have different settings i.e. high, medium, low, high-high, high-low, low-low and have you tried those combinations? Next, pick up the heater (if it won't hurt your back) and give it a robust shake. Try the power again. Any luck? Keep us posted.

Attached to the Black lead inside the cover is the tip switch. If you have power through that, inside a white fiberglass sheath on a red wire is a thermal switch rated at 128degC. I found that mine was bad and removed it. You have to cut it off and solder the leads together. This wire carries all the current in the unit so a poor solder job will probably cause a fire. Do it right the first time.

try tipping unit over to reset the safety switch that was activated when it fell. u may have to do this a few times.

Can you describe what you mean by "does not respond correctly to switches"? Does your heater make any heat? Does your unit have a thermostat and do you hear the it click on/off when you adjust it?? Do you have one or two (high or low) heating ranges? If it has two, does it make heat when on just one or the other range?

It may be a faulty switch, or an open-circuit heating element. To check this you need a voltmeter/multimeter and some tools to access the switch panel. Unless you know what you are doing and are reasonably competent around electricity I sugeest you take it to a service technician.
You need to check that a voltage exists on both sides of the switch. If is not so, the switch is faulty. If it is present on both sides of the switch, you need to check circuit of heater using the resistance measuring section of the multimeter.

I don't have a definitive answer but I have an idea you could try. With the power plug removed from the socket, pick the unit up and give it some really good shakes and possibly turn it upside down. I am guessing the unit contains an internal "tip-over" sensor which I'm hoping will become unstick and reset itself. After you've given it a good shake, let it settle for fifteen minutes or more, and restore electricity. If your actions reset the sensor (and you're "lucky"), it should heat up and operate normally. If that doesn't solve it, I fear you're SOL and you may need to toss the unit.

As I recall, I found a unit in the dumpster and took it home to check out. I turned it on and had power display but no heat. Started looking around for model number and other info. As I was moving it I heard oil sizzling. The unit has worked since then. There are bimetallic switches inside of them. They tend to stick. Moving it around (dumpster trip, my trip home) allowed it to return to its proper position (normally closed). I have ran into this with many coffee makers, bounce them around a bit and the sensor will reset. Hope this helps you!!