User Guide

10
6. Appliance Control Display
The
LED will be lit for CH (central heating call)
The
LED will be lit for DHW (domestic hot water call)
“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. Pressure can only be read when
the operating display is blank or shows a “A”.
* If factory installed CH Low Water Cut O (LWCO) is below 7 psig [0.5 bar] the main display will ash 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 ashes 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
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
8
9
Burner OFF due to reaching temperature
setpoint
button to turn appliance ON, LED light above
button will be lit when appliance is ON.
NOTICE