Potterton Promax FSB 30 HE Installation & Service Instructions Manual page 57

CONDENSATE PUMP
Reset boiler
and add approx. 1 litre
tap water to the condensate
system via the flue or
sample point
Does the
pump motor run as
the condensate level
rises ?
YES
As the pump motor runs
does the condensate flow to
drain ?
YES
Is
condensate flow
rate at least 1.8 l/min and run
time less than 3
minutes ?
YES
Does
pump motor stop
as level in reservoir
falls ?
YES
Operation correct
© Baxi Heating UK Limited 2010
Condensate pump over level
switch activated - pump
reservoir level too high
resulting in ignition lockout.
Mechanical fault
NO
on float, linkage or switch.
Mechanical fault on pump
or impellor.
YES
If fault cannot be rectified
replace level switch or
pump assembly.
NO
Condensate pump
outlet back check valve
blocked or seized shut.
YES
If fault cannot be rectified
replace pump assembly.
NO
Condensate pipe
has high resistance - too long
or restricted, head greater than
3 metres.
YES
Rectify fault, replacing or
re - routing pipe
if necessary.
NO
Mechanical fault on
float, linkage or level switch.
After 3 mins boiler
will lock out.
YES
If fault cannot be rectified
replace level switch or
pump assembly.
17.0
Lights
On Off On
NO No - replace PCB
5Vdc at B ? No - check wiring.
240V across C & D ?
No - replace level
Go to diagram for
connections to check
NO
blocked or kinked, or outlet
blocked or frozen
YES
Rectify fault, replacing pipe
NO
impellor worn - replace
Condensate
Over-Level Switch
Fault Finding
Lights
* * On
Condensate pump level switch
activated for longer than 3
minutes - boiler locks out.
Boiler will try to relight 4 times
in 5 minutes.
5Vdc at A ?
switch
resistance across C & D
Condensate pipe
at drain.
if necessary.
Pump motor or
pump assembly
Condensate Pump Assembly
Condensate
Condensate Pump
Level Switch
Motor
N L
'C' 'D' 'B'
Is motor
approx. 40 ohms ?
No - replace pump
assembly
gy
gy
PCB
'A'
57