Pages 44 and 45
10:4 FAULT FINDING SYSTEM SUMMER MODE (DHW & CH)
Pages 45 and 46
Air trapped in boiler heat
exchanger
Bleed air from boiler heat exchanger using
manual air vent positioned on top of the boiler
at the rear right hand corner and re-
pressurise if required.
Air trapped in pipe
between tank and plate
heat exchanger
Bleed air from pipe and re-pressurise if
required.
Symptom
Fault
Remedy
Boiler not firing, no DHW or CH
temperature, Tank LED Indicator not
illuminated.
Tank stat and boiler stat
not switched on. Tank
stat or boiler stat faulty.
Turn both stats on and set to desired
temperature.
Test stats - replace if faulty.
Boiler fires, heats DHW tank, changes
over to heat CH, DHW draw off - only
cold water at taps - boiler continues to
heat CH, flow LED indicator not
illuminated.
Faulty flow switch
Faulty relays
Faulty diverter valve
Test flow switch, replace if faulty
Check relay operation, replace faulty
PCB.
Check valve body and actuator, replace
faulty part.
Boiler fires, heats tank, switches to CH -
no heat to CH.
Faulty diverter valve
Room stat faulty or not
calling for heat
Check valve body and actuator, replace
faulty part.
Reset room stat or replace if faulty.
Boiler fires, heats CH and not DWH, tank
LED indicator Illuminated, boiler high limit
manual reset stat tripped.
Diverter valve seized in
CH position
Check valve body and actuator, replace
faulty part.
Boiler fires, heats tank, switches to CH -
no heat to CH, boiler doesn't fire, heating
neon not illuminated.
Control stat switched off
or faulty - failed open
circuit.
Switch control stat on or check correct
functioning of control stat, replace if
faulty.
Boiler fires heats up tank and heating,
DHW draw off - low water pressure/ flow
from hot taps - cold taps OK.
Partially blocked plate
heat exchanger or
partially blocked cold
supply to boiler.
Check cold supply to boiler, check flow
through plate heat exchanger If low -
de-scale or replace plate heat
exchanger.
Boiler fires, heats tank and CH and high
limit trips.
Faulty control stat.
Replace control stat.
Boiler fires heats tank and CH. pressure
relief valve discharges.
Faulty pressure relief
valve.
PRV operates between 2.7 & 3 bar.
When DHW & CH are up to
temperature, pressure should be no
more than 2 bar. An extra vessel may
be needed
Incorrect charging.
Check charging procedure.
Boiler fires, high limit tripped.
Circulating pump
seized.
Free off or replace circulating pump.
Page 53 of 57
Installation & maintenance manual for Camray 5 Combi External Boilers
14/04/2005
file://D:\PL61500\PL61500.htm
