I just checked my pump since my heat pump stopped due to low flow (speed 1650). I cranked it up to 2700 and heat pump started, but motor sounds bogged down (no odd noises). Pressure on filter down near 15. Shouldn't the gauge be high if I need backwashing? (Probably needed). May backwash a minute or two then pull apart for cleaning. Or could it be motor issue (only 1 year old)?