I recently had my Lennox MDP-4035CPM (propane) cleaned by a professional and the guy checked the incoming gas pressure. He said it was low, about 10 psi when it should have been 12 psi. He thought this might have been the issue with it causing soot. He also thinks I should replace the gas valve (about ~$2) and another 1-2 hrs labor, about $4 total. This after a cleaning bill of almost $5.
My questions are
- Do you agree that a low gas pressure could cause the soot problem? (It seems to me that it would have nothing to do with the viability of the flame, rather it would govern how high the flame was in the firebox).
Do you agree that a gas valve that runs a little low is a danger and should be replaced?