Camus Hydronics DFH/W500 Installation, Operation And Service Manual page 62

Alert 291: Abnormal Recycle: Flame was not on at end of ignition
Alert 294: Abnormal Recycle: Flame was lost during Run
Alert 324: Abnormal Recycle: Hardware flame bias
Alert 377: Abnormal Recycle: Hardware flame bias delta
This error occurs when a flame signal is not detected by the flame sensor. A minimum signal of 0.8Vdc must be detected by the
flame sensor to prove the flame.
Check flame
sensor wire
Separated from
harness bundle
Check hot
surface igniter
for minimum
3.0A reading
Yes
Check flame
sensor for
carbon
deposit
No
Verify
differential air
signal is at
0.35" w.c. at
o
115 F return
water
temperature
57
Within harness bundle
No
Yes
No
Move flame sensor wire away from harness bundle
Replace igniter
Clean and/or replace
Adjust VFD parameter 45 (speed at minimum signal)
until 0.35" w.c. is reached across air differential.