Pages 40 to 43
10:3 FAULT FINDING SYSTEM SUMMER MODE (DHW ONLY)
puffing, ignition cuts in
intermittently.
improperly adjusted or faulty
nozzle or unsatisfactory
draught conditions or faulty
in oil supply.
pressure gauge, smoke pump, C02 indicator
and draught gauge, adjust settings as
necessary, replace nozzle if necessary.
See
Commissioning Check List
and Servicing
Notes.
Symptom
Fault
Remedy
High limit thermostat tripped, no
hot water only cold at taps.
Circulating pump seized.
Free off circulating pump or replace
circulating pump.
Boiler not firing, no hot water at
taps. Tank LED not illuminated.
Mains supply not on,
Tank control thermostat
not functioning
Reinstate mains supply check operation of
tank control thermostat and/or replace
Relay/s failed.
change PCB.
Boiler fired, tank at Temperature,
no hot water at taps. Flow LED
not illuminated when DHW is
demanded.
Flow switch not operating
correctly. Relay/s failed
Test function of flow switch, replace if faulty.
Boiler fired, heated tank, tank
LED indicator illuminated, boiler
cycling.
Faulty tank thermostat.
Faulty relay/s jammed in.
Test function of tank thermostat and replace.
Replace PCB.
Boiler fired, heating tank, tripped
manual reset limit thermostat.
DHW Thermostat failed in
NC position.
Test thermostat and replace.
Boiler fires CH heats up when in
summer mode, no DHW.
Diverter valve; seized in
CH position.
Inspect diverter valve body, replace if seized,
check correct operation of actuator head
replace if faulty.
Boiler doesn't fire, circulating
pump on, no DHW at taps only
cold, both relay indicator neon's
illuminated.
DHW stat failed in NO
position.
Test functioning of DHW thermostat and
replace if faulty.
Boiler not firing in summer mode,
no DHW at taps only cold, flow
LED indicator illuminated.
Tank control thermostat
not switched on
Switch tank control thermostat on, set at
desired temperature
Tank thermostat failed in
open circuit position.
Test thermostat, replace if faulty.
Boiler fires, Flow LED indicator
illuminated, boiler keeps firing
with no DHW draw off.
Faulty flow switch.
Test function of flow switch replace if faulty.
Faulty relay - jammed in
energised position.
Replace PCB.
Boiler fires, heats up tank, very
low water pressure/ flow at hot
taps, cold tap pressure ok.
Partially scaled up plate
heat exchanger blockage
on incoming mains to
boiler
De-scale or replace plate heat exchanger
disconnect cold mains to boiler and check for
blockages.
Boiler fires heats up tank, very
low water pressure/ flow hot and
cold taps.
Fault on cold mains
supply to residence.
Check stop cock fully open. Contact local
water supplier and report fault.
Boiler has been functioning
correctly, loss of DHW
temperature, water pressure/ flow
ok.
Air trapped in storage
tank
Bleed air from storage tank using manual air
vent positioned at the top right hand corner.
Allow system to cool, check pressure in
system and re-pressurise if required.
Page 52 of 57
Installation & maintenance manual for Camray 5 Combi External Boilers
14/04/2005
file://D:\PL61500\PL61500.htm
