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WD52/0/1997
5.2
FAULT FINDING FLOW CHART
Is amber switch light on?
yes
Is there 230V between
Is the boiler switched on?
yes
Is the boiler thermostat closed?
Is there 230V between control
box pins 10 & 2 and between
Is the air pressure switch stuck
Is there 230V between control
Is the motor relay operating?
Is there continuity between live
supply from relay to blower &
Neutral through motor
Is motor overload tripped?
Is there wiring continuity
Continued on sheet 2
Installation & Servicing Instructions
Chapter 5 : Fault Finding
START
no
terminals SL & N?
yes
yes
Faulty Switch Neon
-Replace.
Is the f an running?
no
yes
pins 10 and 1?
yes
in the NO position?
no
box pins 6 & neutral?
yes
yes
resistance?
no
no
& in-line connector
to motor?
The Keston 130 Condensing Boiler
Apply Power To Boiler.
no
Check External Controls.
no
Switch On Boiler.
no
Boiler return is too hot. Allow
to cool. OR faulty thermostat -
Replce.
no
Check continuity (see section
5.3)
yes
Faulty pipe connections to Air
Press. Switch. OR Faulty Air
Press. Switch - Replace.
no
Control box faulty.
no
Relay not secure in socket or
relay faulty - replace
yes
Motor/Fan fault y - Replace.
yes
Wait for motor to cool.
no
Identify & correct break.
Page : 26
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