Jan 26, 2010 Some new furnaces have a feature that when it has an issue, it starts the room air blower until you reset the thermostat or kill power to the furnace. What do I need to do? Does this mean I can wire it directly to the line voltage? Rick, I would look for a control circuit that may be starting the fan first then a circuit that would start and stop the heating coils. Or control wiring with the gas furnace. At times, everything works fine. This proves the gas is being consumed and not spewing into the environment. He has written more than 30 home improvement books and countless magazine articles.
The house is cold and the furnace needs to come on to heat the house. Wiring color code or symbols, wiring harness, radio and audio wiring, circuit diagram, light switch wiring diagram. Typically, there are three trials for ignition. It depends on the engineering, The difference being the forced draft blower blows air through the heat exchanger s. The igniter will glow and you will be able to see it if viewed thru the small inspection port. On a call for heat, the 24 volt thermostat sends a signal to the control module.
Dan You can make sure it is not the thermostat by crossing or jumping the R and W terminals or associated wires together. The pressure switch is a safety switch. Proper furnace troubleshooting techniques can solve this issue. It lights the main burners on a call for heat. If the flame sensor does not detect a flame the ignition module will go into a lock-out mode. What is the sequence of operation of a indirect fire to a pilot? Either a pilot will come on or the burner tube will ignite then spread the flame to all burners.
I never recommend making modifications to any appliance outside what the manufacturer suggests. That will suck up dust and fine particles like a vacuum cleaner as the return side of the duct work is a negative pressure. This is a safety measure to prevent a dangerous buildup of gas. Rather, you will have the 24 volts on a single leg. Lastly, the electronic ignition gas systems can also be used on boilers. I have replaced the circut board and the safety button already.
You can identify an intermittent pilot by its heavy-gauge wire leading to a device with a metal tip that is positioned next to the end of a small gas line, which supplies the pilot flame. Been having problems with having the furnace kicking on. It sounds like the thermostat is wired so the blower is being told to start instead of the heating unit. Having issues with my furnace recently. Heatman will know many more details than I.
Some furnaces have either a forced draft motor and others have an induced draft motor. The fan has six wires coming out of it, 1 purple, 1 brown, 1 red, 1 blue, 1 black, and 1 green. Or a gas furnace problem in the safety circuit. He is the most experienced expert here for this area. On that diagram there will be a diagnostic chart.
This allows heat to be dissipated from the heat exchanger. Be sure the additional fan is properly integrated into the furnace system for proper control and operation which is permissible as an optional part of the furnace system. The unit will not run if there is no signal from the thermostat bad thermostat or broken wire , the control module does not sense a signal from the thermostat bad control , the inducer does not energize bad motor , the pressure switch does not close blocked vent piping, bad switch, plugged condensate hose , the igniter does not energize bad control, bad igniter , the gas valve does not open or there is no gas bad gas valve, broken wire, no gas , the pilot does not light dirty pilot , the burner does not light bad burner, plugged orifice, not enough combustion air , the flame does not spread to each burner bad flame spreader, dirty flame spreader, more bad burners , the flame safety sensor does not detect flame dirty or bad flame spreader, bad flame sensor, broken wire, bad control , or the room air blower does not energize bad fan motor, bad control. The thermostat is the first part of the sequence of operation for the gas furnace. Both of those failures can be one in the same. Any suggestions for further investigation of this problem? The existing circuit may not be used if it is rated smaller than either of the new required circuits. I did that and it works fine until I connect a ground from the ground lug in the unit to the ground bar in the electric supply panel.
Remove the top front panel and look just insdie on the side panels. If the board has blinking lights, refer to the chart to decipher the code and help identify the problem area with the furnace. In fact, most furnaces these days don't have pilot lights, or at least standing pilot lights—the kind that burns all the time and has to be relighted when they go out. Or was it the flame sensor contamination that prevented the circuit board from energizing the solenoid? The codes are listed in a chart in the owner's manual and usually on a door or access panel on the furnace. The hot surface ignition direct to pilot is likely the Honeywell Smart Valve where the hot surface ignition lights the pilot and then the pilot lights the main burner. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve 24 volts. Furthermore, mercury is very hazardous to the environment and not many manufacturers use this type of electronic ignition.