Challenger User Manual

10
Appliance Control Display
Function
Main Display
Operating Display
OFF
XXP
XXP
XXX
7
Press
No demand for heat
Control self-test
Fan pre purge or post purge cycle
Space Heating (CH) post pump cycle
XXX
XXX
6
A
1
Ignition sequence
XXX
2
Burner ON for space heating (CH)
XXX
LOP*
3
Burner ON for domestic hot water (DHW)
4
Burner ON for DHW pre-heating
Raise CH pressure above 7 psig [0.5 bar]
ODS**
Outdoor sensor not installed
POLE
Incoming line and neutral are reversed
Burner ON for freeze protection
The
LED will be lit for CH (central heating call)
8
9
Burner OFF due to reaching temperature
setpoint
button to turn appliance ON
LED lite above button will be lit
The
LED will be lit for DHW (domestic call)
NOTICE
when appliance is ON
“X” represents temperature or pressure readings. When temperature is displayed it
will be followed by “ºF” or “ºC” in the main display and the appropriate LED will be
lit. When pressure is displayed it will be followed by a “P” in the main display. Pres-
sure can only be read when the operating display is blank or shows a “A”.
* If factory installed CH Low Water Cut Off (LWCO) is below 7 psig [0.5 bar] the main display
will flash a soft lockout of LOP (burner and CH primary pump is blocked) followed by the
pressure reading. Once CH system pressure is increased above 7 psig [0.5 bar] normal boiler
operation will be restored. Check LWCO wiring if LOP flashes to 90 _P (PSI) or 6.0 _P (bar).
** If the outdoor sensor is not installed the main display will display ODS when the boiler is in
standby without a CH or DHW call for heat or any errors. The lack of the outdoor sensor will
not prevent the unit from operating on a CH or DHW call for heat, but is recommended to
increase system efficiency