Little giant condensate pump.
Heat pump water heater condensate drain.
No problems so far i just run my condensate line to a condensate pump which then pumps the water to a drain in my basement.
Why would a condensate pump line into a drain be a problem when the pump has a check valve which allows no back leakage of gas or water and if the drain ever clogged it would back up either way anyhow reply.
Not sure how they determine that your line is plugged whether it s pressure or some other means.
The recommendation is to get a condensate drain kit for convenient draining and metal drain pans to protect the room where the heater is installed.
Power vent and power direct vent heaters are equipped with the condensate drain so the water vapor from the exhaust gases will roll down the pvc vent pipe and through the drain port out.
All piping is properly installed insulated sealed free of leaks and protected from exposed elements below freezing temperatures if applicable.
If the drain line gets clogged or the condensate pan is set improperly the water will run over and cause a leak.
I have a hp water heater as well.
Condensate drain lines are properly installed and piped to an adequate drain or condensate pump installed.
The state hybrid manual says to put water heater in standby mode then turn off power remove access panel on fan side by loosening screws wipe dirt and debris to clean pan inspect line for clogs and kinks do not reduce drain tube into smaller line put cover back and restore power then system performs diagnostic prior to operation.
I d call tech support and scour the internet there s probably a sensor that s gone bad.