20
Ix - USER INTERFACE qUICK REFERENCE
STANDBY MODE - KEY FUNCTIONS AND DISPLAY
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
Stby
then displays
Sequence
and
Measured or Target Outlet Temperature
.
0 180
Press and Hold Key(s) in BLACK
(1)
Duration
Result
Display
[MODE] [STEP] [STORE]
[+]
[-]
tap
Outlet water target temperature.
(Display shows “c” and outlet water
target temp.)
(2)
c 190
Hold
Turn space heating OFF/ON.
(Display shows “c” and outlet water temp.
or OFF.)
[MODE] [STEP] [STORE] [+]
[-]
tap
Show factory setting for DHW.
(Make sure to adjust desired water
temperature for DHW on the DHW tank aquastat.)
d 140
Hold
Turn DHW OFF/ON.
(Display shows “d” and DHW factory setting or OFF.)
[MODE]
[STEP] [STORE]
[+]
[-]
Hold
Set burner to high fire.
(Display shows “H” and measured outlet water
temp.)
H 180
[MODE]
[STEP] [STORE] [+]
[-]
Hold
Set burner to low fire.
(Display shows “L” and measured outlet water
temp.)
L 180
[MODE] [STEP] [STORE]
[+]
[-]
Hold
Deactivate forced high/low firing.
(Display shows sequence and
measured outlet water temp.)
0 180
[MODE]
[STEP] [STORE] [+] [-]
tap
Change to next mode.
(Para)
Para
(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.
STANDBY MODE - BOILER SEqUENCE DISPLAY
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.
Press [
RESET]
button to restart boiler without waiting for timeouts below.
First
Digit
Other
Digits
Boiler Status
0
Actual (measured) outlet water temperature
Standby - no call for heat
1
Pre-purge (10 seconds) or Post-purge (15
seconds)
2
ignition
3
Burner on for CH heating
4
Burner on for DHW heating
5
Checking airflow before prepurge
6
Burner off because temperature setting
has been reached
7
Pump on after CH heating cycle for run-on
of 10 seconds
8
Pump on after DHW heating cycle for run-
on of 30 seconds
H
Burner on, running in high fire mode
(manually set for test)
l
Burner on, running in low fire mode
(manually set for test)
First
Digit
Code
#
Boiler is in soft lockout when “9” or “b” shown. Reason
for boiler soft lockout is:
“9”
alternating with
“b”
_18
Outlet temp. too high (over 203°F). Burner off until outlet
water temp. drops 9°F below target temp.
_19
Return temp. too high (over 203°F). Burner off until both
outlet and return water temp. drops 9°F below target temp.
_24
Return temp. higher than supply temp. Burner off waiting for
correction.
_25 Outlet water temp. rose too quickly. Burner off 10 min. (burner
recycles, increasing wait 1 min. each attempt to max. 15 min.)
_26
External limit open, LWCO tripped or 3.5” press switch open on limit
wired in soft lockout (auto reset) circuit. Burner off for 2½ minutes.
_29
Blower signal not 0 when it should be. Burner off until signal
condition terminates.
_30
Temp. rise across boiler more than 100°F. Burner off for 2½
minute wait (plus 1 minute for each failed attempt, up to max.
of 22 minutes each time).
_61 air pressure switch does not open.
_65 Waiting for blower to start.
