26
Order
State
Code
Number
Definition
Explanation
2. Other possible state codes
h
4
Pre-purge
System is purging before ignition trial; includes Pilot Valve circuit diagnostics. On vent
damper models, this is so quick it will typically be over before the display can flash
this code, and therefore will rarely be visible.
i
9
Post-purge
System is purging after heat cycle. On vent damper models, this is so quick it will
typically be over before the display can flash this code, and therefore will rarely be
visible.
j
10
Retry Recycle
Delay
5 minute delay after pilot signal is lost.
Either:
1.
Control failed to detect flame after spark period. Check pilot for
contamination, check ignition wire; check electrical ground; Check pilot flame.
2.
Control lost pilot flame signal AFTER main burners were lit. Check for
adequate draft and combustion air. Check gas line for adequate pressure.
k
13
Soft lock out
Soft lock out duration is one hour, may override with manual reset. Appropriate error
code will flash alternately.
l
14
Hard lock out
Requires manual reset. Unacceptable high water temperature (err 65) and onboard
electronics failure ( er 18) are the only two (2) hard lockouts on this model.
m
15
Wait for limit to
close
One of the safety limits - rollout, vent spill, or low water cutoff (if one is field
installed on the 24V safety circuit) has been activated. Control will resume normal
operation once limit is reset. Underlying cause why the limit switch opened
MUST be
investigated.
n
16
Flame out of
sequence
Flame signal sensed before trial ignition. Appropriate alarm is sent.
OR
Flame signal sensed out of sequence during post purge
OR
Flame signal present when not expected. Appropriate alarm is sent.
o
17
Diagnostics
Onboard self check performed at various points during the operation sequence.
p
19
Wait for damper
switch to close
Damper is closed and control waits for damper switch to close. Checked at beginning
of heat cycle before opening damper. If damper does not open in 60 seconds, control
goes to State 20. Control may also be in state 15 if one of the safety limits is open.
q
20
Wait for damper to
open (Failed close)
Damper has not opened (end switch not closed) at beginning of heat cycle. Alarm
message is sent, control is NOT in lockout. Control will resume normal operation once
the damper opens.
r
21
Wait for damper to
close (Failed open)
Damper has not closed despite actuator de-energized. Alarm message sent, control is
NOT in lockout.
Table 6 conti. - Vent Damper Models Operation State Codes
APPENDIX A - CONTROL MODULE
