Potterton Promax FSB 30 HE Installation & Service Instructions Manual page 52

DRY-FIRE
Is the
system full of water ?
YES
Is the
pump running ?
YES
Unplug
5-way PCB
connector. Is
there continuity
between H
NO
Disconnect
Flow Switch Inline
connector. With pump running is
there continuity across flow
switch ?
NO
Remove
flow switch from boiler.
Is there a physical blockage to
the paddle within the
flow switch ?
YES
Remove Blockage.
52
© Baxi Heating UK Limited 2010
Lights
* *
NO
Fill system with water and
bleed out all air.
NO
Pump or Pump Wiring
fault.
YES
Replace PCB.
YES
Wires from inline
connector to PCB faulty.
NO
Is there a
blockage in the system ?
YES
Remove Blockage.
17.0
On
Viewed from
Wire Entry end
NO
Replace Flow Switch.
Fault Finding
H