AO error Hayward h400 heater- cant troubleshoot

feinerl

Member
May 21, 2008
17
Ridgewood NJ
I get an AO error. I looked through the hayward manual. 120v to blower motor, 5ohms blower motoe resistance. I can get the heater to start by sucking and blowing on the vacuum hose. Heater runs fine for one minute then cuts out. The unit had a bd error and i have tried 2 different icb boards both of which cleared the bd error and both give the ao error. if i jump the switch i get an ac error. Switch seems good resistance is low and opens with minimal suction
any ideas as to what is going on would be greatly appreciated