Fairly new to
posting, hope this works to add to this thread.
I have a similar situation with two AC units and one
water pump. Just to spice it up, I was having the HI PS issue with the salon unit and no issue with the Aft unit. Flushed the forward system and no improvement. Turned out it was the pressure switch that was bad on that unit.
Now I have a different issue. Four days ago both units
lost power. (No HI PS error codes) Reset the breakers the next morning (it happened just as I was turning in) and everything was working.
Two days ago and again as I was going to
bed, the HI PS alarms went off on both units. Yesterday morning (before finding this thread) I was set to take out the
water pump and plugged it into a different outlet. Water pump started working and worked all day with it plugged into the original supply source - there is a relay circuit for the pump.
Last night as I was going to
bed, you guessed it, the HI PS errors on both units. This morning, the water pump seems to have given up the ghost. It does not start with either
power source. I checked the power to the
plug in the system (not the alternate source) and with the relay breaker on, it has power. I had not checked this yesterday.
So, is the water pump bad? There is power to the
plug for the water pump whether either unit is calling for the water pump to turn on. Each unit independently will cycle through attempts to get water circulating and then shut down. I don't know whether there is some other signal to the water pump or it is all controlled through power to the plug in the system.
Appreciate any
advice. My AC guy is here tomorrow, but it will be very hot tonight without AC all day.
David