SG Series Boilers – Installation and Service Manual
10
Display
Code
State Specific Description
Operation Sequence
Idle/Standby The boiler is in standby - no call for heat
StA ↔1
Run circulator Heat request present but boiler water temperature sufficiently high to
run circulator pump only (no ignition sequence)
Thermostat Calls For Heat
Self Test Hardware self check, check of connected periphery, it is performed
at start up, in the beginning of the heat cycle and in the “Wait For
recovery” state
StA ↔17
Wait for recovery There is an external error and the control is waiting to recover, no
lockout
Circulator output energizes
StA ↔ 2
Wait for end switch
to open
The control is waiting for the end switch of the vent damper to open
at the beginning of a heat cycle. If the end switch doesn’t open in 60
seconds, the control goes to error code Err 2
StA ↔ 3
Wait for end switch
to close
The control is waiting for the end switch of venting damper to close at
the beginning of a cycle. If the end switch doesn’t close within 60
seconds, the control goes to error code Err 29
StA ↔ 4
Pump pre-purge/
thermal purge
System is purging before ignition trial-safety relay diagnostics
followed safety relay switch-on during last 2 seconds this sate
StA ↔ 6
Spark, ignition
activation
System is sparking permanently 13 seconds whilst pilot gas valve
relay is turned on
StA ↔ 7
Prove flame System is proving flame signal, typically 2 seconds
StA ↔ 8
Running System is in running mode, flame signal must be present
Call For Heat Ends
StA ↔ 9
Pump post-purge System is purging at the end of a call for heat
Troubleshooting/Diagnostics
StA ↔10
Inter-purge
(retry/recycle delay)
If the control loses flame signal during state code 7 or 8, or flame is
not detected during stat code 6 to 8, it will recycle through the 30
seconds purge time and last 2 seconds part of pre-purge time
Err ↔ 2
Wait for end switch
to open – failed
closed
The end switch of venting damper has not opened at the beginning
of the heat cycle. The control is not in lockout
Err ↔ 29
Wait for end switch
to close – failed
open
Waiting time for pressure switch to close expired. The control is not
in lockout
Err ↔ 62
Soft lockout System is shutdown and will re-start following an enforced delay
StA ↔15
Wait for limit to close
There may be a call for heat from the thermostat, but the limit switch
is open
Flame out of
sequence – before
trial
Flame signal sensed before trial for ignition.
Flame out of
sequence – after
trial
Flame out of sequence during post-purge.
StA ↔16
Wait for flame loss Flame signal still present when not expected.
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