这个炉子3年前某“著名”师傅换过pressure switch, 收费430

1. it will say “heat on “ but the furnace and fan don’t actually turn on (as per picture) 2. It will try and kick in. (Fan and furnace will start for 20seconds but then shut off when it’s below temperature). It will try and kick in 2-3 times like that. Then it just won’t come on for an hour or two. 
3. Long gaps between running. Temperature will drop to 22 or 21 before coming on. It will run until desired temperature but then not come back on for a while. 
Below is picture. It’s happening now where it says on. But it’s not actually running. 
I tried setting all the times and dates to run at consistent 25. 
Even if I manually raise the temp it won’t engage. 
Sometimes there is a “recovery” word that pops up in the thermostat. 

1.有时候温控器显示'heat on”（加热）的信息，但炉子和风扇实际上并没有工作（如图所示）。
2.它会尝试启动。（风扇和炉子会启动20秒，但在低于设定温度之前就会停止。它将尝试像这样2-3次。然后静止一两个小时。
3.运行之间的间隙过长。温度会降到22或21，然后再升高。它会一直运行到设定的温度，然后会停止很长的时间。

下面是图片显示为加热中，但实际上并没有运行。

我尝试将所有时间和日期设置为一致的25度。
即使我手动提高温度（温控器），炉子也不会启动。
有时温控器中会弹出“恢复”字样。