Potterton Promax 12 SL Installation And Service Instructions Manual page 54

FAN LOCKOUT
Unplug
3-way PCB connector
& unplug fan. Is there
continuity from N to O &
from P to Q ?
YES
Unplug
the smaller of the
6-way PCB connector. Is there
continuity from R to S & from T
to U & from
V to W ?
YES
Replace fan.
54
© Baxi Heating UK Ltd 2007
Lights
Flash Flash On
ON
NO
Rectify wiring.
NO
Rectify wiring.
17.0 Fault Finding
NOTE: The fan is supplied with 325 Vdc.
Fan Fault Finding should only be carried out after the
boiler has been electrically isolated.
Fan
Connection
N
P
Fan
Connection
R
T
V
PCB
Connection
O
Q
PCB
Connection
S
U
W
Viewed from
Wire Entry end