AERCO BMK 2.0 LN Nat. Gas for Mass. only - Manual (Page 69)

TROUBLESHOOTING
16. Shut down VFD power.
17. Turn On VFD power.
18. Set Pr. 59 to 1
19. Recalibrate the boiler using the combustion calibration procedures in Chapter 4.
Table 8-5. VFD Faults
NOTE
Check parameters 55, 56, 57, & 58 for the last 4 Trips.
VFD Fault Possible Cause
U U Low AC supply voltage
OU High AC supply voltage
O.ht2 High ambient temperature
CL1 Analog input loss
(4-20 mA Air/Fuel Valve position signal)
EEF Possible loss of parameters values
C.dAt Empty SmartStick has been read
C.Err Bad connection or faulty SmartStick
C.Acc Bad connection or faulty SmartStick
8-15