炉子是NUGK050MF07,大约13年了。
有趣的是这好像是一个此种产品的普遍问题。下面是从google上查到的。
“
Furnace won't light and fan runs constantly
: I have a Heil NUGK075KG06 furnace that the blower motor runs constantly (fan switch on the programmable thermostat is set to AUTO). When the thermostat calls for heat, the gas valve doesn't get energized, so the burners never get any gas. If I jump the "LIMIT" terminal to the 24 VAC on the fan control module (Heatcraft Model FTC5-EH01 or Heil 1005229) the gas turns on and the furnace appears to run normally. Is the problem a bad furnace control module?
”
但我不知道如何调节FTC5-EH01。
It looks like there is a switch was shut off. It is used to protect furnace from over heat.The person in the post bypassed it, so furnace worked again. It is not a good practice. Your furnace may need some clearing or the filter is dirty.This cause furnace to burn too hot then the switch shut off to protect it. You better call a professional to do a service.Over heating will damage the heat exchanger which is the key component of furnace. That switch could be reset after cleaning is done.