Holmes HFH5506, new out of the box. Thermometer in room (at same level) says 66. Heater is not coming on until control setting is at 74-78, even then, it comes on for 60 seconds only. LO or HI , no matter.
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It always helps to add the model number of the item you want help on. However if it's like the newer units, the fan operates whenever the heater wall has reached a high enough temperature and shuts off when the heater cools off. It is not wired into your thermostat or electrically wired to the heater. It does that with a temperature driven fan switch in a little junction box mounted to the heater. Normally when that box gets hot because the heater is on the fan comes on, when it cools off the fan goes off. The junction box will have an ac cord coming out of it. If this fan switch junction box is not properly mounted it could be getting cooled off when the fan starts and then shuts itself off. After it heats up again it starts the fan. The other possibility is the temperature based fan switch is failing and needs replacement. See link.
Many recommend you plug the heater in and turn it on in a well-ventilated room (like a garage) for the few hours of use. If you are using the heater to warm a room, plug it in with the thermostat set to maximum and set the power selector to 3 until the room reaches the desired temperature. Then rotate the thermostat clockwise until you hear a click. You can set the power level to 1 or 2 to conserve energy while maintaining the current temperature settings.
If you are trying to avoid frozen pipes in an area, plug in the heater and set the power selector to 3 and thermostat to *.
Always remember to keep anything flammable away from the heater (loose drapes etc.) There is an overheating protection circuit built into the unit. To reset it, you need to call the DeLonghi service center.
Sounds like you're low on refrigerant. You might try to measure the room temperature and the temperature coming out of the grill. The temperature coming out of the grill should be about 20° lower than the room temperature. For instance if the room temperature is 80°, then the temperature coming out of the griil should be about 60°.
my heater did the same, very frustrating.
i have solved this problem.
i took off the plastic cover to expose the electronic circuit board and noticed that there was a white residue on the board. I wiped this clean with rubbing alcohol and put everything back. as of 3 weeks ago i have used the heater frequently as normal and not had any problems.
I had the same problem.
this is what i did.
unplug the heater.
removed the plastic panel to expose the control panel where the blinking light is.
Removed all the dust and cobweb build up, then using rubbing alcohol, wiped the white residue that was on the green circuit board.
I did this 10 days ago and the heater has been working fine since then.
After calling Vornado Corporation, they suggested that the room temperature monitor might be failing as it read 65 degrees no matter where you started the heater. I took the unit back to the store I purchased it from, and we unpacked another unit and found the same problem existed. Therefore, the product is not capable of heating a room properly and I will continue my search for a space heater to control the temperature in my upstairs office which does not have air ducts for heat.
If anyone has recommendations I would be interested in their comments.