90
Service Manual - NeoTherm 500
Appendix 1 - Error Codes (continued)
App1
cont.
Code Description
L or H
Procedure
11
Internal fault:
Invalid burner control state flag
L
Internal fault
1. Reset module
2. If fault repeats, replace module.
12
Internal fault:
Safety relay drive cap short
H
Internal fault
1. Reset module
2. If fault repeats, replace module.
13
Internal fault:
PII (Pre-Ignition Interlock) shorted to ILK
(Interlock)
H or L
Internal fault
1. Reset module
2. If fault repeats, replace module.
15
Internal fault:
Safety relay test failed due to feedback on
L
Internal fault
1. Reset module
2. If fault repeats, replace module.
16
Internal fault:
Safety relay test failed due to safety relay off
L
Internal fault
1. Reset module
2. If fault repeats, replace module.
17
Internal fault:
Safety relay test failed due to safety relay
not off
L
Internal fault
1. Reset module
2. If fault repeats, replace module.
18
Internal fault:
Safety relay test failed due to feedback not
on
L
Internal fault
1. Reset module
2. If fault repeats, replace module.
19
Internal fault:
Safety RAM write
L
Internal fault
1. Reset module
2. If fault repeats, replace module.
20
Internal fault:
Flame ripple and overflow
H
Internal fault
1. Reset module
2. If fault repeats, replace module.
21
Internal fault:
Flame number of sample mismatch
H
Internal fault
1. Reset module
2. If fault repeats, replace module.
22
Internal fault:
Flame bias out of range
H
Internal fault
1. Reset module
2. If fault repeats, replace module.
23
Internal fault:
Bias changed since heating cycle starts
H
Internal fault
1. Reset module
2. If fault repeats, replace module.
24
Internal fault:
Spark voltage stuck low or high
H
Internal fault
1. Reset module
2. If fault repeats, replace module.
25
Internal fault:
Spark voltage changed too much during
flame sensing time
H
Internal fault
1. Reset module
2. If fault repeats, replace module.
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