WH-SXC09H3E5, WH-SXC12H6E5, WH-UX09HE5, WH-UX12HE5 - Panasonic Air Conditioner Service Manual (repair manual). Page 110

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110 
Zone Pump Control during Anti-Freeze 
Zone pump control during Zone Anti-Freeze Control: 
When Zone Anti-Freeze Flag=1, Zone Pump Turn ON. 
When Zone Anti-Freeze Flag=0, Zone Pump Turn OFF. 
Zone pump control during Indoor Anti-Freeze Control: 
-  Zone pump only ON/OFF if the Extension PCB connected and Buffer Tank select "NO" condition 
When Indoor Anti-Freeze flag=1, Zone Pump Turn ON 
When Indoor Anti-Freeze flag=0, Zone Pump Turn OFF 
* Pool Water Pump will not affected by both Indoor anti-freeze control or zone anti-freeze control. 
12.2.3  Water Pump Speed Feedback Error 
  Basically pump speed feedback is control by micon. 
  When pump speed is below low limit or over high limit for a few seconds, micon detect pump error and system is 
stopped. 
  Error detection conditions: 
-  Detect abnormal water pump speed for continuous 10 secs. 
-  Current pump speed < 700 rpm or 
-  Current pump speed > 6000rpm for 10 seconds. 
 Control 
contents: 
-  When error occurs, water pump, heating and heater is stopped for 30 seconds then restart again (Retry 
control). 
-  When micon detect error again, system is stopped and error code [H20] is displayed at control panel. 
 
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