Air Purification Products
Honeywell® Thermostats
Humidifiers
Unit Heaters
HVACR TOOLS
Accessories
James A/C Co.
serving Do-It-Yourselfers since 1990.
Satisfying every customer....one at a time!
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Call toll free 1-866-584-0355 or 1-903-759-2160
309 Patriot Circle, Longview, TX 75604-2240
THINGS TO CHECK IF THE FAN WON'T COME ON BUT THE BURNERS DO:
- A Bad motor is as likely as not the problem. But, check
the wires going to it for breaks and terminals on the fan relay. Manually turn it on at the thermostat "fan on" switch and
see if it runs. If it does, you have a problem with the heating speed or the relay or other controls. Make sure the fan
control on the heating chamber is working. Change the fan to another speed to see if it works. Check the fan capacitor.
See the Cooling section The fan won't run or makes noise".
- Fan and/or limit switch combination control bad. If this part gives a
problem, replace it. You can try adjusting it, but it probably will not help unless it has been set previously to a
very high setting.
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The temperature probe extends into the furnace and senses the temperature of the air between two of the furnace chambers. As it
warms, the switch in the front section will turn on the fan. It usually controls a low speed of the fan. If the fan doesn't work or
if the air is blocked by a dirty coil or other obstruction, then the chamber will over-heat and the probe of this fan/limit will
activate a set of contact points that will open and the burners will be turned off for safety. |
Note: You can remove the metal front on the fan/limit switch and if you like, just discard it. The newer models don't even supply
the metal front cover. Removing this metal cover will allow you to see the movement of the control and watch it turn things on and
off or you may adjust the switch setting. They should not need adjustment, however, and if you feel the need to adjust it, then it
probably needs to be replaced or the air flow problem needs to be solved.
Careful inspection of the front of this control will reveal two separately functioning sides of the device, one that operates the
fan on and off and the other operates the maximum temperature limit switch. One side will be marked FAN and the other side will be
labeled LIMIT. Most commonly, two wires will plug into pressure clamping receptacles on each side. Some manufacturers use only
three wires with the factory jumper in place at the center of the bottom of the device, thus making one of the wires common to
both operations. If four wires are used, the jumper is physically broken to make the two side operations independent. If this
is done, the fan side operation will be 125 VAC while the limit side may be 25 VAC. When the jumper is still there and the device
has three wires only, then the voltage will all be 125 VAC.
See also fan control in the thermostat section.
- Gas pressure extremely low to the burners will cause an extremely long
delay of the fan coming on for some models.
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Click here
and send me your request by e–mail or phone.
1–866–584–0355 (toll free) or 903–759–2160 FAX 903–759–4605
If you have
comments or suggestions, please email me at James' A/C Co.
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