Summer is here, and so is the heat... and unfortunately, my heater as well. Thankfully for box fans, and a breaker switch though.
Anyways, as long as the breaker to the furnace is on, the heater is on, doesn't matter if I set the thermostat for Cool, Fan, or heat, it stays on. If it is on Cool though, the A/C will come on, but the heat stays on with it.
I got a new thermostat, I'm sure it is hooked up right, I have looked everywhere online to make sure, and it all matches up.
If you can diagnose the problem. Great! That will help me alot. If you can find a way to shut off the heat and only the heat, then thats Wonderful!
At least If I can find a workaround, I can then do that for a few months until I have the money to get a professional to come out and look at it.
Thanks In advance, hope to get an answer very soon, supposed to be HOT next week, -Jon
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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.
I had the same problem with my fan and solved it with a reset. The reset button is on the back of the remote next to the dip switches. You have to take the battery cover off to see it.
Turn on the fan with heat, even though the heat doesn't work. Then, leaving the remote on, turn off the fan at the wall switch (or circuit breaker box). Wait a few minutes. Then turn on the power and within 30 seconds, press the reset button. You should be able to see a countdown from 5 to 0 on the remote screen.
It sounds like the fan relay in the stat itself is not closing when you make the switch over. If you have had the stat for less then 5 years it is covered. Honeywell has a full 5 year warranty on their focus pro stats, and would replace it free of charge.
Had similar problem, continuous fan, turn off power, then won't start up. Replaced thermostat, no change. The main controller board in the furnace went bad. What was weird was that it happened in the summer, while the heat was turned off. One day I noticed that the fan was running. The thermostat was in the off position, and I had to shut off power to the furnace to make it stop. I forgot about it till heating season came along and it wouldn't start up. The preliminary blower would start, the gas would click on, it would light, then quit. After tracing and checking the various safety switches, etc. it became apparrent the main board was bad. I found one on ebay, replaced it, [a simple job, unplug, a few screws, replug] and it's been working fine..good luck, John
This is an easily fixed problem. There are two thermistor switches on Dayton furnaces. One controls the fan motor run function and the heater valve on/off function. The other called a blocked vent switch (located in the top front of the heater) stops the gas valve from opening in the event the
vent is plugged. However, if the furnace was totally shut down for the summer and is now being fired up for winter, the block vent switch has to be reset. The switch has a reset button on it, push it and it should solve your problem. Also, check to make sure the fan run thermistor is clean and does not have debris around it as that acts a insulator for heat to keep the fan run function on.