Potterton Promax Store 24 Installation And Service Manual page 50

Fault Finding Solutions Sections
A
Is there 230V at:
1. Main terminals L and N
2. Main terminal fuse
3.
PCB - X1 connector
terminals 1,2
B
Is there 230V at:
1.
X3 Connection Pump PCB
X2 Connection Pump PCB
X1 Control PCB
X3 Control PCB, T3, T4
X1 Pump PCB
Replace Pump
C
1. CH system pressure less than 0.5 bar
2.
Check the tap of the automatic
air vent is opened
D
1.
Fan connections correct at fan.
PCB - X2 connector, is 230V AC
across terminals 5 & 7
50
NO
NO
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
NO
Check electrical supply
Replace fuse
Check wiring
Check incoming wiring
Replace Pump PCB
Check wiring
Replace Control PCB
Replace Pump PCB
YES
Re-pressurise system
Check connection water
pressure switch terminal
COM - NO and PCB connector
X400 terminals 3,4
Open the automatic air vent
Fan jammed or faulty winding
Replace PCB
NO
Display
illuminated
YES
Replace water
pressure switch
YES
Replace fan
© Baxi Heating UK Ltd 2015
Replace PCB