The boilers are in standby mode unless they run into an error condition. In standby mode the
boiler displays the temperature of the supply water. Cascade temperature is displayed if the
cascade temperature sensor is installed (normally placed after the header). Otherwise the
supply temperature sensor is displayed on the LCD.
In error condition the boiler will show the error code starting with the address of the boiler that
produced the error code (F is related to the display), then the type of the error (A is lock-out
error, E is a limiting condition) and a two digit number which designates the type of the error.
Refer to Section 4.13 for details of error codes.
LCD -without error condition:
seg1 to seg3 Displayed CH supply temperature, otherwise blinking “--” is displayed
dgr + seg5 Symbol °C or °F if CH supply temperature value is valid
P1 Indication of presence of slave DSP, off on terminal DSP
pmp Indication of pump running
m Indication of ame present
sun Displayed when CH mode is inhibited (SUMMER)
doff Displayed when DHW mode is inhibited (DHW-OFF / ECO)
ch Indication of CH mode service
dhw Indication of DHW mode service
ot OpenTherm master detected
otc Outside temperature sensor is connected
LCD -during error condition:
seg1 Displayed source of error (master only).
seg2 Displayed “A” for lockout error, “E” for non-locking error.
seg3 to seg4 Error code displayed
P1 Indication of presence of slave DSP, off on terminal DSP
pmp Indication of pump running
m Indication of ame present
sun Displayed when CH mode is inhibited (SUMMER)
doff Displayed when DHW mode is inhibited (DHW-OFF / ECO)
ch Indication of CH mode service
dhw Indication of DHW mode service
ot OpenTherm master detected
otc Outside temperature sensor is connected
P2 Blinking when lockout error is displayed
reset1 Blinking when lockout error is displayed
P6 Blinking when error is related to MAXSYS0, or local device at position of MAXSYS0
P3 Blinking when error is related to MAXSYS1, or local device at position of MAXSYS1
3.14.2
STANDBY MODE ON MASTER DSP
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