I have an Beckett oil furnace and a digital thermostat. When the temp in the house drops below the temp set on thermostat, the thermostat send a signal to the furnace but the furnace does not start. When I press the restart button on the furnace it starts, heats the home to the set temp and then shuts down but it won't restart once the temp in the house drops again. What could be the problem?
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Re: furnace wont start when thermostat sends signal
By restart button you mean reset i believe,its located on top of oil burner and says only push one time .if thats the button your pushing it is the reset button or retry for oil burner if you are pushing this there is a problem with burner
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Sounds as though another problem is showing up. Verify T-stat is sending the red 24volts (alt current) through the White wire. This can be done at the t-stat or the furnace whichever is easier to access. At t-stat your meter will show 24volts from red to any wire that the t-stat is not jumping to. So if you put on lead on Red and other on White and 24 shows up the t-stat is not connecting that and the furnace will (NOT) turn on heat. If you get 24 on Y or G but nothing on White then the t-stat is (Good) and the furnace in not kicking on.
To diagnose furnace look for flashing light on board. count flashes and read furnace diagram for info. Furnace diagnosis will take some patience and observation of what happens when. Problems can be Airflow, or parts. It takes some watching. I've found tools jammed in vent stacks, blocked (dirty) evaporators and failing sensors or relays. All causing the units to start but not stay lit.
the thermostat sends a signal to the circuit board. Not knowing anymore than I do about your heater or furnace I would suggest that that is a good place to start. Any limit or safety switch wouldnt coincidentally shut off the heater when it reached the set temp.
You will likely need to install an isolation relay in the W circuit from the thermostat. Some thermostats rob a small current through the W circuit to power the thermostat. This small current can be enough to start the fan circuit timer. You can test this by disconnecting W at the furnace and allowing the timer to shut down. If the fan shuts off with the W disconnected you can install a simple relay.
The relay coil will be connected to Common on one side and the W from the thermostat to the other. Then you will run a wire from R on the furnace to the relay and from the N.O. Contacts to the W terminal on the furnace. This will kill that signal that is starting the timer and the W can steal it's power through the coil back to common.
The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier. Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/
However - the problem is probably not with your thermostat but with your furnace. It is most likely a dirty flame sensor - a maintenance issue. If you have not had your furnace serviced recently (more than 1 year) that is where you should start. Modern furnaces require regular maintenance.
Try cleaning the flame sensor. It is located right besides the last burner. Looks like a thick piece of wire. Take steel wool and gently remove the carbon that has built up. Should only take 4 or 5 strokes. Let me know how it goes after that. ken
do you live there? if so here are the rules for setting back temperature: do not lower the temperature more than 8 degrees F from the temperature you want it when your there, setting it back for periods of less than eight hours is also somewhat futile. Due to laws of thermo-dynamics the heat required to recover from more extreme setbacks or shorter periods of time exceeds the savings acquired by taking said action. As to your question directly there are no reasons why your thermostat should not function at any setpoint temperature that it is allowed to set to (45 normally being the lowest) if it does not function below 58 degrees it has a failure and should be replaced before it fails completely. Suggest a Robertshaw or Braeburn brand thermostat, Honeywell quality has slipped over the past decade to unacceptable levels. Unless your considering a Hunter in which case buy another Honeywell.