| Your gas furnace is not working and you think | | | | the pressure switch first; it is much less |
| that the pressure switch is bad. Here are some | | | | expensive to replace. |
| things to check and the steps to replace it. | | | | Once you isolate that this switch is faulty, then |
| Replacing is not very difficult at all, in fact it is one | | | | you can change it. This is very simple. For most |
| of the easiest thing that you can replace yourself. | | | | furnaces the wiring is low voltage, so the risk of |
| Your gas furnace purge blower runs and never | | | | shock is minimal. You should still turn off the |
| shuts off but your furnace is not producing any | | | | power to be safe. Remove the screws that |
| heat. Or your igniter will glow, light the burners and | | | | secure the switch and then just switch the two |
| then the furnace will shut right back down and try | | | | wires over to the new switch and secure the |
| to recycle all over again. Either one of these | | | | screws again. |
| conditions are common if the switch is going bad | | | | That's all there is too it a very simple operation. |
| or has failed. | | | | Turn the power back on to the furnace. Re-fire |
| You can check the switch by placing a jumper | | | | the furnace and check the operation of the unit. It |
| wire across the wires going to the switch once | | | | takes a while for the unit to cycle through the |
| the purge blower has started. If the burner lights | | | | lighting process but you should have a furnace |
| and stays lit the pressure switch is probably your | | | | that now heats your house just fine. |
| problem. Could be a weak blower, but I would try | | | | |