Baxi PRIME HT 240 Installers And Users Instructions page 18

- fault messages
In the event of fault, the display panel on the QAA73 shows the flashing symbol
the error code and a description of the fault.
Code Display
10
Outsidesense
20
Boilersensor
28
Flue gas
50
DHW sensor
60
QAA73 fault
110
Boiler STL
119
W-pressSwi
125
-
130
FlueGasLimit
133
No flame
151
Burn lockout
155
Reset off
160
Fan speed
15.3 CONNECTING THE OUTDOOR TEMPERATURE SENSOR PROBE
The SIEMENS model QAC34 outdoor temperature sensor probe (optional accessory) must be connected to terminals 5-6
of terminal board M2 in figure 13.
The procedures for setting the gradient of the temperature curve "kt" vary depending on the accessories connected to
the boiler.
a) Without the QAA73 temperature regulator
When an outdoor temperature sensor is connected, the central heating temperature control knob (fig. 14) shifts the hea-
ting curves (graph 2).
Turn the knob clockwise to increase room temperature, anti-clockwise to decrease it. Figure 14 shows the correct position
of the knob for operation without shifting the curves.
Figure 14
Fault description
Outdoor temperature probe sensor fault (or parameter 75 disabled)
NTC delivery sensor fault
NTC flue sensor fault
NTC domestic hot water sensor fault
Ambient temperature probe fault
Safety thermostat tripped
No signal from water pressure switch
Pump blocked
NTC flue sensor has cut out for overheat
Gas supply fault (No gas)
Boiler control card internal error
Maximum number of reset attempts (5) exceeded
Fan speed threshold not reached
Modify parameter 532 on the QAA73 temperature regulator
to select the desired temperature curve "Kt", as instructed
in the table of chapter 26.
Graph 1 shows the available temperature curves.
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INSTRUCTIONS FOR THE INSTALLER
. Press the information key ( ) to display