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.
Water pressure too high - You have put too much water pressure in your systemE40
Water pressure error - You must top up the water pressure for your systemE37
Mains supply frequency incorrect - There may be a problem with your power supply.E35
Mains supply voltage < 180V - There may be a problem with your power supplyE34
Flame drop out - Check for obstruction of the flue and/or air terminals,
blockage/freezing of the drain pipe or a low gas supply (LPG).
E26
Water pressure losses - You have topped up the water pressure more than 4 times in
24 hours. You may have a leak on the system..
E24
Boiler overheat - Check that any valves to the heating circuit have not been shut down,
that there is no air in the system and that the water pressure is correct..
E03
False flame - There is possibly a problem with the power supply.E02
Ignition failure - the boiler has attempted to light five times and not succeeded - check
the gas supply is on.
E01
Description of faultDisplay
The above is an abbreviate 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,
press the “Reset” button to resume boiler operation. If the code persists consult a GAS SAFE
REGISTER registered engineer.
When topping up the water pressure you can observe the actual pressure by pressing the
“Installer” button repeatedly until the number “5” appears. After a few seconds the display with
then change to show the system water pressure in bar. Set the water pressure to between 1.0
and 2.0 bar.
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.
Frost Protection
The C36 Combi has an integral frost protection function. However, care should also be taken
that any exposed pipework is adequately insulated to prevent freezing.
1.4 SAFETY INFORMATION
IF YOU SUSPECT A GAS LEAK TURN OFF THE APPLIANCE IMMEDIATELY, TURN OFF
THE GAS TAP TO THE APPLIANCE (LOCATED UNDERNEATH)
AND CONTACT YOUR LOCAL GAS REGION WITHOUT DELAY.
Benchmark Initiative
As part of the industry wide “Benchmark” initiative C36 Combi boiler manual includes Gas
Boiler Commissioning Checklist (Chapter 10). This form should be completed by your
installer at the end of the installation and commissioning process. The details of the Checklist
will be required in the event of any warranty work being required. There is also Service
Interval Record (Chapter 10) to be completed after each annual service visit.
These forms (Chapter 10) should be kept in a safe place for the life of the boiler.
The boiler should be installed and serviced only by GAS SAFE REGISTER registered
operatives. All GAS SAFE REGISTER registered Installers carry a GAS SAFE REGISTER ID
card and have a registration number. Both should be recorded in your boiler manual
(Chapter 10: GAS BOILER COMMISSIONING CHECKLIST). You can check your installer by
calling GAS SAFE REGISTER direct on 0800 408 5500.
WD388/0/2004 Chapter 1 : User Instructions The Keston C36 Combi & C36P Combi Boilers
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