All gas appliance controls submerged during any flood must be replaced. This would include valves on water heaters and clothes dryers, as well as furnaces and boilers. This is not merely our recommendation, but also that of all major control manufacturers. Just drying out a gas control WILL NOT remove the abrasive silt, which remains in contact with gas cocks, bleed orifices, pilot safety mechanisms, valve seats and diaphragms. As for electronic controls and electric motors, you may be successful drying out circuit boards and other similar components. Motors may also work once they've been dried out, but the oil contained in the wicking reservoir was probably washed out. If you oil it, it runs, and doesn't make any noise (especially at startup or shutdown), you're probably OK - at least for a while. Draft inducer pressure proving switches should also be a high liability concern. If they've become water logged, or there is a strong chance that silt has entered and settled on the diaphragm seat, they should also be replaced.
With all this said, we wish to remind you that JOHNSTONE SUPPLY of PHILADELPHIA has the LARGEST selection of OEM and after-market HVAC and appliance replacement parts anywhere in the Delaware Valley. What you think you can only get at an exclusive equipment distributor is probably also sitting on our shelves - in quantity. Our competition has probably already referred you to us in the past for some pretty odd stuff. Such as hard to find Flair zone valve and vent damper parts. Very old or obsolete Honeywell ignition modules, OEM circuit boards, high capacity and/or step opening gas valves, strange draft inducer blowers (e.g. Hydrotherm, Carrier/Bryant, Heil, Trane, Weil McLain, Lennox & others), or unusual pilot assemblies such as Honeywell CS82s, General Controls PG9s and PG1s and old White-Rodgers or Stemco flame switches. If it was ever made, especially long ago, we probably have at least one on the shelf.
