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When boiler is powered on, the display will always show a single character (which represents the boiler's current operating sequence)
followed by the measured outlet water temperature during self-test.
When entering Standby Mode, user
interface display briefly shows Stby
Press and Hold Key(s) in BLACK
[MODE] [STEP] [STORE]
[MODE] [STEP] [STORE] [+]
[STEP] [STORE]
[MODE]
[STEP] [STORE] [+]
[MODE]
[MODE] [STEP] [STORE]
[STEP] [STORE] [+] [-]
[MODE]
(1)
Where two keys are shown pressed at the same time, you must press the keys together. A slight delay in pressing one of the keys may
cause a different result.
(2)
Outlet water "target temperature" means:
Outdoor sensor not connected - Target is fixed setpoint temp. Control attempts to maintain boiler outlet water temperature to setpoint.
Outdoor sensor connected - Target is temperature calculated by control module based on outside air temperature.
after display shows Stby for a brief period, the first character shows boiler status, followed by boiler outlet water temp. If the burner is
being held off due to a soft lockout, the display alternates between showing "9" followed by boiler outlet water temp. and "b" followed by
the two-digit codes below. Soft lockout means the boiler will start again automatically if the condition is corrected or timed out.
First
Other
Digit
Digits
Standby - no call for heat
0
Pre-purge (10 seconds) or Post-purge (15
1
seconds)
2
ignition
3
Burner on for CH heating
Burner on for DHW heating
4
5
Checking airflow before prepurge
Burner off because temperature setting
6
has been reached
Pump on after CH heating cycle for run-on
7
of 10 seconds
Pump on after DHW heating cycle for run-
8
on of 30 seconds
Burner on, running in high fire mode
H
(manually set for test)
Burner on, running in low fire mode
l
(manually set for test)
Ix - USER INTERFACE qUICK REFERENCE
STANDBY MODE - KEY FUNCTIONS AND DISPLAY
Stby
then displays Sequence and Measured or Target Outlet Temperature.
(1)
Duration
Outlet water target temperature. (Display shows "c" and outlet water
tap
target temp.)
[-]
[+]
Turn space heating OFF/ON. (Display shows "c" and outlet water temp.
Hold
or OFF.)
Show factory setting for DHW. (Make sure to adjust desired water
tap
temperature for DHW on the DHW tank aquastat.)
[-]
Turn DHW OFF/ON. (Display shows "d" and DHW factory setting or OFF.)
Hold
Set burner to high fire. (Display shows "H" and measured outlet water
[-]
[+]
Hold
temp.)
Set burner to low fire. (Display shows "L" and measured outlet water
[-]
Hold
temp.)
Deactivate forced high/low firing. (Display shows sequence and
[+] [-]
Hold
measured outlet water temp.)
Change to next mode. (Para)
tap
STANDBY MODE - BOILER SEqUENCE DISPLAY
Press [RESET] button to restart boiler without waiting for timeouts below.
Boiler Status
Result
(2)
First
Code
Boiler is in soft lockout when "9" or "b" shown. Reason
Digit
#
for boiler soft lockout is:
Outlet temp. too high (over 203°F). Burner off until outlet
_18
water temp. drops 9°F below target temp.
Return temp. too high (over 203°F). Burner off until both
_19
outlet and return water temp. drops 9°F below target temp.
Return temp. higher than supply temp. Burner off waiting for
_24
correction.
Outlet water temp. rose too quickly. Burner off 10 min. (burner
_25
recycles, increasing wait 1 min. each attempt to max. 15 min.)
External limit open, LWCO tripped or 3.5" press switch open on limit
_26
wired in soft lockout (auto reset) circuit. Burner off for 2½ minutes.
Blower signal not 0 when it should be. Burner off until signal
_29
condition terminates.
Temp. rise across boiler more than 100°F. Burner off for 2½
minute wait (plus 1 minute for each failed attempt, up to max.
_30
of 22 minutes each time).
_61 air pressure switch does not open.
_65 Waiting for blower to start.
20
0 180
Display
c 190
d 140
H 180
L 180
0 180
Para
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