I had a water leak in the furnace room (Didn't actually witness the leak, only found the puddle that was partly dried up) and suspected the condensate pump, a Little Giant Pump Company VCM-15UL approx 15 yrs. old.
Hoping for an easy repair, I replaced the line from the condensate pump to the sewer drain, the line looked partially blocked. That seems to have fixed the leak, no leaks after two weeks, but I think it was also shown me what the actual cause of the problem is.
When the pump runs now, (and it does run more frequently) I can see the water being pumped out through the clear line. The water that makes it over the rise runs to the drain but the water that is still in the vertical rise portion of the line (approx 6') drains back into the pump once the pump stops.
Should there not be a check valve that prevents water from flowing back into the pump once the water has been pumped into the drainage line? If that's the case, does it usually warrant a pump cleaning, check valve replacement, pump replacement or burn down the house and hope to collect insurance money?
Thanks for your thoughts,