I have an Emerald DS-4, 240V, 2001 model year?, dual electronic topside control, 2-speed pump + booster pump, pushbutton topside thermo control, electric heat.

It was working OK and then the outside temp went to 20F. Now the display alternates between FLO, COOL and 60deg. Maybe just a coincidence? Somehow it is keeping the temp in the 60's.

When I power on/off to reset, the circulation pump comes on for a few seconds and then turns off.

Should I try to run w/o filters?

Any advice appreciated.

Thanks