Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 119

Diagnostics
(cont.)
Function
"State DHW pump Q3"
"State circulating pump
Q4"
"DHW temperature actual
value" (B3)
"DHW temperature set
value 1"
"Flow temp setp VK1"
"Flow temp setp VK2"
"Primary controller
temp"
"Buffer temp actual val-
ue" (B4)
"Buffer setpoint"
"Buffer temp actual val-
ue" (B41)
"Buffer temp actual val-
ue" (B3)
"State relay output QX1"
(central fault message fa-
cility)
"State relay output QX2"
"State relay output QX3"
(diverter valve)
"State relay output QX4"
"State relay output QX21
mixer extension 1"
"State relay output QX22
mixer extension 1"
"State relay output QX23
mixer extension 1"
"State relay output QX21
mixer extension 2"
"State relay output QX22
mixer extension 2"
"State relay output QX23
mixer extension 2"
"State relay output QX21
mixer extension 3"
Code Operat- From/
ing lev- switch-
el ing state
8820 "F2" "Off"
8822 "F2" "Off"
8830 "F2" 0.0
8831 "F2" 8.0
8875 "F2" 5.0
8885 "F2" 5.0
8930 "F2" 0.0
8980 "F2" 0.0
8981 "F2" 0.0
8982 "F2" 0.0
8983 "F2" 0.0
9031 "F2" "Off"
9032 "F2" "Off"
9033 "F2" "Off"
9034 "F2" "Off"
9050 "F2" "Off"
9051 "F2" "Off"
9052 "F2" "Off"
9053 "F2" "Off"
9054 "F2" "Off"
9055 "F2" "Off"
9056 "F2" "Off"
Service scans
To/switching Unit
state
"On"
"On"
140.0 °C
80.0 °C
130.0 °C
130.0 °C
140.0 °C
140.0 °C
140.0 °C
140.0 °C
140.0 °C
"On"
"On"
"On"
"On"
"On"
"On"
"On"
"On"
"On"
"On"
"On"
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