Intellitec electronic climate control management thermostat
My 1997 Fleetwood 37' PAV has 2 a/c units and 2 furnaces all controlled by the intellitec electronic climate control thermostat (00-00597-000) in combination with the ecc energy management unit master controller (00-00591-100). Everything works fine except my rear furnace which does not come on at all. I have eliminated it down to either the thermostat or the master control unit. But how do I figure out which is the problem?
I understand that there is a relay inside the master controller that has to close when energized for the furnace to turn on. When I unplug the pc4 plug and jumper pins 4 and 5, the furnace starts, no problem. So for some reason, that relay inside the controller is not closing. How do I tell if it is because the relay is bad or if the thermostat is not sending the signal? The only wires coming out of the thermostat are a brown one and a yellow one (it also has the two thermistors coming into it). How does it signal to the controller what unit I am trying to turn on? And finally, if it is the controller, is it possible to take it apart and just replace the internal relay? According to the troubleshooting guide in the service manual, when you move the temperature setting up and down, you should hear a click from the controller relay at some point along the scale. I do hear the click. It says if you don't hear a click, replace the controller. But I do hear a click, so I go to the next step which says to jumper the pc4 plug. That does make my furnace start. But the guide doesn't tell me what that means. It only says that if t doesn't start, check for loose wiring. Can anyone please help?
I understand that there is a relay inside the master controller that has to close when energized for the furnace to turn on. When I unplug the pc4 plug and jumper pins 4 and 5, the furnace starts, no problem. So for some reason, that relay inside the controller is not closing. How do I tell if it is because the relay is bad or if the thermostat is not sending the signal? The only wires coming out of the thermostat are a brown one and a yellow one (it also has the two thermistors coming into it). How does it signal to the controller what unit I am trying to turn on? And finally, if it is the controller, is it possible to take it apart and just replace the internal relay? According to the troubleshooting guide in the service manual, when you move the temperature setting up and down, you should hear a click from the controller relay at some point along the scale. I do hear the click. It says if you don't hear a click, replace the controller. But I do hear a click, so I go to the next step which says to jumper the pc4 plug. That does make my furnace start. But the guide doesn't tell me what that means. It only says that if t doesn't start, check for loose wiring. Can anyone please help?
