Do not remove the pressure tank from the pump unless it has been vented through the air escape valve. The pump is installed correctly and the lines into and out of the pump are both hot. Do not use force when connecting the pipes to the pump. To obtain service under this warranty, the Comfort System Hot Water Recirculation System. Have you installed the Grundfos Comfort Series Instant Hot Water Recirculator or the WATTS Premiere Instant Hot Water Recirculator. 10. Comfort valves / sensor valves close once hot … The Grundfos MQ is a non-submersible pump. I checked online, and am guessing I need a new bypass valve. 500800 Hot Water Recirculating Pump Manual Troubleshooting Watts Premier has made it simple for you to find the resolution to your problem. A hot water recirculating pump is convenient and adds comfort, as it means getting hot water faster when you turn on the hot tap. and not by Grundfos' warranty. 66600 Apodaca, N.L. 2. 2941 Brighton Road Boulevard TLC No. These problems exist with thermostatic comfort valve recirculation systems according to nearly 100 professionals at the 2006 Southern California Annual Plumbing Heating Cooling Contractors trade show. Homes that have on-demand or tankless water heaters, this is significant, since otherwise it would be a bit of a wait before the cold water clears out of the pipes and the hot water reaches you. Both of these systems use a comfort valve or sensor valve which gets installed at the farthest sink from the water heater. Re: grundfos cs-1 comfort system; Author: Paul48 (CT) It's not about doing it wrong....the valve has to have check valves in it,their way of troubleshooting it confirms that.Without knowing exactly what is going on,I wouldn't feel comfortable without putting an expansion tank in unless I … Grundfos will not be liable for damage or wear to products caused by abnormal operating conditions, accident, abuse, misuse, unauthorized alteration or repair, or if the product was not installed in accordance with Grundfos' printed installation and operating instructions. The plumber mentions that the check valve inside is not necessary but I can leave it. Do not start the pump unless it has been filled with water, or primed. There was a check valve installed horizontally just before the tank, so now I have 2. 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