Hayward H250 IDL AO Error Code

[Kevink]

I just replaced the combustion blower motor in my Hayward H250 IDL. The old when made some funny noises then just quit altogether. When it quit, I did NOT have the AO error. LED display was normal and the heater just hummed on start up but no blower.

Now after replacing the blower with a new one, I have the AO error. Heater starts up, I can hear the blower working fine, then after 30 seconds or so I get the AO error. I checked the tubing, it looks good. Any ideas? Not sure what would cause the AO error now after replacing the blower motor. It was working fine until the day it went out.

 

[JamesW]

Is the blower connected to the right voltage?

Note: Do not change the voltage unless you are 100% that that is the right thing to do.

If you connect 230 volts to a 115 motor, you will destroy the motor.

 

[Kevink]

The heater is connected to 220 volts and the motor I just replaced it with is the 240 volt version. I just swapped out the motors.

 

[1poolman1]

AO CODE POSSIBLE CAUSE	MAIN FIXES
VACUUM SWITCH TUBING IS FAULTY	Replace tubing
A FAULTY VACUUM SWITCH WIRING	Secure Wire Harness Terminal to Spade on Vacuum Switch
BAD BLOWER WIRING OR CONNECTION	Ensure Blower Plug Is Fastened on The Control Module
A DEFECTIVE VACUUM SWITCH	Measure Resistance on Blower Windings
BAD BLOWER RELAY	Measure If 120VAC Is Present on Blower Relay Endings
VACUUM SWITCH IS DEFECTIVE	Replace A Defective Vacuum Switch

The entire page with test procedures is here:

Hayward Heater AO Code: Causes and Fixes - Airlucent

Q: I'm dealing with an AO code on my Hayward heater. Could you explain how the heater works and guide me through diagnosing and fixing this issue?- Alex Hall

airlucent.com

 

[Kevink]

AO CODE POSSIBLE CAUSE	MAIN FIXES
VACUUM SWITCH TUBING IS FAULTY	Replace tubing
A FAULTY VACUUM SWITCH WIRING	Secure Wire Harness Terminal to Spade on Vacuum Switch
BAD BLOWER WIRING OR CONNECTION	Ensure Blower Plug Is Fastened on The Control Module
A DEFECTIVE VACUUM SWITCH	Measure Resistance on Blower Windings
BAD BLOWER RELAY	Measure If 120VAC Is Present on Blower Relay Endings
VACUUM SWITCH IS DEFECTIVE	Replace A Defective Vacuum Switch

The entire page with test procedures is here:

Hayward Heater AO Code: Causes and Fixes - Airlucent

Q: I'm dealing with an AO code on my Hayward heater. Could you explain how the heater works and guide me through diagnosing and fixing this issue?- Alex Hall

airlucent.com

Thank you