A.O. Smith Boiler 3400 User Manual

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To support the recommended Troubleshooting, the R7910 has an Alert File. Review the Alert history for possible trends that may have
been occurring prior to the actual Lockout.
Note Column: H= Hold message; L=Lockout message; H or L= either Hold or Lockout depending on Parameter Conguration.
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
LOCKOUT CODES
NOTE
Safety Data Faults
1 Uncongured safety data 1. New Device, complete device conguration and
safety verication.
2. If fault repeats, replace module.
L
2 Waiting for safety data verication 1. Device in Conguration mode and safety
parameters need verication and a device needs
reset to complete verication.
2. Conguration ended without verication, re enter
conguration, verify safety parameters and reset
device to complete verication.
3. If fault repeats, replace module.
L
Internal Operation Errors
3 Internal fault: Hardware fault Internal Fault.
1. Reset Module.
2. If fault repeats, replace module.
H
4 Internal fault: Safety Relay key feedback error H
5 Internal fault: Unstable power (DCDC) output H
6 Internal fault: Invalid processor clock H
7 Internal fault: Safety relay drive error H
8 Internal fault: Zero crossing not detected H
9 Internal fault: Flame bias out of range H
10 Internal fault: Invalid Burner control state L
11 Internal fault: Invalid Burner control state ag L
12 Internal fault: Safety relay drive cap short H
13 Internal fault: PII shorted to ILK H or L
14 Internal fault: HFS shorted to LCI H or L
15 Internal fault: Safety relay test failed due to
feedback ON
L
16 Internal fault: Safety relay test failed due to safety
relay OFF
L
17 Internal fault: Safety relay test failed due to safety
relay not OFF
L
18 Internal fault: Safety relay test failed due to
feedback not ON
L
19 Internal fault: Safety RAM write L
20 Internal fault: Flame ripple and overow H
21 Internal fault: Flame number of sample mismatch H
22 Internal fault: Flame bias out of range H
23 Internal fault: Bias changed since heating cycle
starts
H
24 Internal fault: Spark voltage stuck low or high H
25 Internal fault: Spark voltage changed too much
during ame sensing time
H
26 Internal fault: Static ame ripple H
27 Internal fault: Flame rod shorted to ground
detected
H
28 Internal fault: A/D linearity test fails H
29 Internal fault: Flame bias cannot be set in range H
TROUBLESHOOTING
TABLE 24. TROUBLESHOOTING CODES

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