We have 2 water furnace envision series installed in residential setting - units appear to be running aux elec heat too often. The NSZ022A11AC has the WATER FLOW led flashing red- looking for some advice on what usually causes this (assuming it is not normal) The 2nd system nsh036A100CER STATUS is Green does this indicate normal operation

This might help a bit:
http://www.waterfurnace.ca/homeowners/faq.php#collapseSeven

Water Flow A sensor protects your unit against internal freeze up caused by a water flow loss in the heating mode. When the WATER FLOW light is on, this signals that internal freezing conditions have occurred. This may be caused by a pump failure, low antifreeze level or air pockets in the loop piping (see resetting the unit section, below).

Status A blinking green STATUS light indicates that the microprocessor control, which is the “brain” of the unit, is operating properly. If the light doesn’t flash but remains continuously on or off, the control is inoperative. Turn off all power to the unit, including auxiliary heat, and then turn it back on. If the light remains continuously on or off, call your WaterFurnace dealer.

Neither of those looks good to me. :-(