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WD420/3/2007
Normal Operation
During normal operation the digital display will show the current boiler temperature and will
show relevant operational symbols to confirm what action the boiler is taking. If the "radiator",
] ] ] ]
or "
" symbol is shown on the display the boiler is receiving a demand for that function.
Fault Modes
In the event that the boiler detects a situation which it considers to be a fault the display will
change to show a flashing fault code starting with an "E" and then a two digit number. The
table below explains these codes and the action you should take.
Display
Description of fault
E02
Ignition lockout - the boiler has attempted to light five times and not succeeded - check
the gas supply is on.
E04
Flame failure whilst running - the boiler is having difficulty maintaining the flame.
Consult your Service Engineer and check for flue, gas supply or condensate drainage
obstruction
E12
Flow overheat - the boiler has exceeded it maximum water temperature. Check that any
by-pass is open and the controls are operating correctly
E26 or
The system water pressure is too low. Check the system has water in and, for sealed
E67
systems, top up the system water pressure to restore a pressure of between 1 and 2
bar. (Consult your installer for instruction how to top up water pressure - repeated need
for restoration of water pressure indicates a system leak which should be investigated)
E25
The boiler temperature is rising too fast - ask your Service Engineer to check for
system blockage or pump failure.
E52
The flue temperature is too high. Consult your Service Engineer - SERVICE RESET
REQUIRED
E62
Water pressure too high - check that the system water pressure top-up valve has not
been left open or consult your installer to check the expansion vessel.
E70
The cabinet has overheated - consult your Service Engineer before operating the boiler
further - SERVICE RESET REQUIRED
The above is an abbreviated list of possible error codes. If the code is not in the list above
consult a GAS SAFE REGISTER registered engineer. A full list of codes can be found in
Chapter 6 of this manual. If a code appears and you feel the original cause has been rectified
and it has not been designated as requiring a "Service Reset", press the "Reset" button to
resume boiler operation. Otherwise, or if the code persists consult a GAS SAFE REGISTER
registered engineer.
Raise up the system pressure until error E67 or E26 disappears from display (the boiler will
enter in standby mode or will start to fire up if a heat demand exists). To check the system
pressure press the "T T T T " button repeatedly until the display shows the water pressure, indicated
by the word "bar" to the right of the number. To return to main screen press the RESET
button.
Precautions
Care must be taken at all times to ensure that no blockage or obstruction is present in the
condensate drainage line. In addition, the air intake and flue exhaust terminals must be free
from obstruction at all times.
Care should be taken not to damage the condensate trap protruding from the base of the
boiler. Any sign of leakage of this part should be reported to a GAS SAFE REGISTER
registered engineer immediately. If the part becomes broken the boiler should be turned off
and a GAS SAFE REGISTER registered engineer contacted to make a repair.
Any indication of leakage from the boiler cabinet should be investigates by a GAS SAFE
REGISTER engineer.
Frost Protection
The Qudos 28s has an integral frost protection function. However, care should also be taken
that any exposed pipework is adequately insulated to prevent freezing.
Installation & Servicing Instructions
Chapter 1 : User Instructions
The Keston Qudos 28s & Qudos 28sP Boilers
Page : 2
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