Mike Hobbs

I have an in-deck 1999 Marquis Euphoria and it developed a leak earlier this winter. Rather than pull up deck boards in the snow and cold, I figured I'd just wait for spring and keep topping off the water in the mean time. Anyway, the water has run low a couple of times and caused the heat circulation lines to freeze up and the panel would display FLO and/or OH. Previously, I've been able to thaw out the line by pouring warm water into the intake below the filters. This last time, though, it wouldn't budge, so I hooked a garden hose up to a hot water spigot in the garage and directed the water into the intake. Still wouldn't budge. So then I directed it into the heater output. That freed it up, but shortly after, the panel displayed Sn1. Is it possible that I damaged the high-limit sensor by directing hot water into the heater output? I haven't measured, but I'd guess that our hot water is around 150 F. Thanks, - Mike