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17.0 Fault Finding
52
© Baxi Heating UK Ltd 2011
DRY-FIRE
NO
Fill system with water and
bleed out all air.
YES
NO
YES
NO
Is the
system full of water ?
Is the
pump running ?
Unplug
5-way PCB
connector. Is
there continuity
between H
Disconnect
Flow Switch Inline
connector. With pump running is
there continuity across flow
switch ?
Remove Blockage.
NO
YES
NO
YES
Pump or Pump Wiring
fault.
Is there a
blockage in the system ?
YES
Replace PCB.
Wires from inline
connector to PCB faulty.
Remove
flow switch from boiler.
Is there a physical blockage to
the paddle within the
flow switch ?
Replace Flow Switch.
Remove Blockage.
YES
NO
Viewed from
Wire Entry end
H
Lights
On
*
*