I have a Carrier Aquasnap M#30RAN030A that won't restart after it shuts down on set point. I get no alarms and general ops look good. No safeties are tripped and system seems to be configured properly.
If I power down the control circuit, system will start and run until it shuts off on set point and then won't restart.
We just recently had all the sensors calibrated by our in house calibration/metrology department and am wondering if it might be possible that they may have damaged something on the MBB.
Yesterday I was getting operating modes 7, 8 and 9 on and 26 on but pressures and ops all very good. Checked this morning and it is off. Operating mode 9 and 26 are on.
All readings have been from the Navigator, but will be verifing with gauges and meters as soon as I finish this.
EB Ward tech support was not very helpful yesterday but will be calling them again today. They said that the MBB is in a "protection mode".
The space sensor is not hooked up and reads -40, but the unit was working fine before calibration with that sensor not installed, this is actually the first problem we have had with this unit since installation (Dec 2002) and has been the lag chiller since the calibration in January.
I will have more information later today, but was hoping that someone could get me started in the right direction if this is a control board issue or if anyone has had this problem in the past...