I have a ruud silhouette II that is around 5 years old and we have the thermostat set at 72 but house will only get to about 68. The heater will run for 15 minutes and then shut off for about 30 seconds and fire back up again. I know my pressure sensor is starting to go bad.once in a while I have to tap on that side of the heater to get it to start. Could this also be making it run like it is now?