Cause of error code A24

Lost flame signal 3 times during one heat call. 

Solution for error code A24

1. Inspect harness connection flame sensor. Is connection clean and secure?
Yes: -> 2
No: Replace flame sensor or harness.

2. Remove flame sensor. Is rod free of contamination? 
Yes: -> 3
No: Replace flame sensor and burner

3. Follow opereration instructions to initiate boiler operation. Enter installer menu, boiler status, flame signal. Is flame signal greater the 3.7µA? 
Yes: Replace control module
No: Replace flame sensor and burner