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WD53/0/1998
Continued from
sheet 1.
Continued on
Sheet 3
Installation & Servicing Instructions
Chapter 5 : Fault Finding
Is the module fan running ?
Is the integral sequence controller
calling the module on?
Is the module return
thermostat closed ?
Is there 230VAC between control
box pins 10 & 2 and between
pins 10 & 1?
Is the air pressure switch
stuck in the NO position ?
Is there 230VAC between control
box pin 6 and neutral ?
Is the fan motor relay operating ?
Is there continuity between the live
supply from relay to blower and
neutral through the motor resistance ?
Is the motor overload tripped ?
(Motor will cycle rapidly)
Is there wiring continuity through
the in-line connector to the motor ?
* The integral sequence control can be temporarily by-passed for fault diagnosis purposes
by moving the module link wire from module terminal 8 to module terminal 7.
The Keston 260 & 340 Condensing Boiler
*
Boiler flow is too hot.
Adjust set point higher or
allow to cool or
faulty sequence control.
Module return is too hot.
Allow to cool or
N
faulty thermostat - replace.
Check continuity (see
section 5.3).
Fault hose connection to
APS OR
Faulty APS - Replace
Control box faulty
Relay not secure in socket
Or relay faulty - replace.
Motor/Fan faulty -
replace
Wait for motor to cool.
Identify & correct break
Page : 22
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