Furnace 不工作, 急! 请教高人

[iiWii]

再次应用以前的测量结果.
[ 我又重新测量了一次, 在PIC1, 温控器设定21C, 室内温度17C, 有火苗pilot, A和C之间电压交流0V. D和C之间电压交流26V. A和D之间电压交流26V..在PIC1, 温控器设定13C, 室内温度17C, 有火苗pilot, A和C之间电压交流26V. D和C之间电压交流26V. A和D之间电压交流0V.

当温控器设定温度大于室内温度时, coil线圈的电压是26v, 按理应该开启气体阀门点燃主火至少一会, 但是一直没有, pilot倒是一直燃着.
if the frame sensor/pilot shuts the circuit off, 我该怎么判断, 如果是那样, 我该如何维修? 谢谢!

When you have the coil at 26V for a while, you can touch the coil where the two black wires coming from. If it warms up a little bit, which means the solenoid stuck, if not, the coil must be open or not being energized.

One interesting thing is the voltage 26Vac should be lower if the coil is energized. The load should draw quite a bit current and the voltage should drop a volt or two easily. It should not be the same reading. It could be poor contact...

 

[ccc]

LZ应该换上新锅炉了吧?

 

[hitony]

Thank you all, new furnace has been installed today.

 

[rayzhang]

Can you tell me which company you used for installing the new furnace? Thank you.

Thank you all, new furnace has been installed today.

 

[ccc]

The info might be helpful during this time of the year.

 

[mgao99]

It is time to change a new furnace, 20 year too old. You wast too much gas for heating 30% up. Why are you buy 20 years home?

 

[ccc]

It is time to change a new furnace, 20 year too old. You wast too much gas for heating 30% up. Why are you buy 20 years home?

正确。　２０年的房子算青年，百年老房更好。

Thank you all, new furnace has been installed today.

 

[blueray]

If it is the problem of module, do not try to replace it. I had a cleaning(does not look like a good thing) last year and then the module did not work anymore. I had it replaced and paid about $500. It is much better to get a new furnace because of the government rebate.

 

[ccc]

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