From the failure phenomenon analysis, normal water detection, fault should be on the control panel or the fan. First check the fan, fan resistance measurement is normal. To boot, the output voltage measured with fan, fan is stuck? Commissioning again, the fan impeller with all screwdriver, fan operation, the follow-up action is also normal, normal combustion, gas temperature is normal also, determine the fan start capacitance is not enough, after the new troubleshooting.ad5service manual download site