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13 - TROUBLE SHOOTING
13.1 Troubleshooting
This boiler is fitted with an electronic regulation and control
unit.
Control system is a microprocessor, Comfort Master©, which
controls and protects the boiler. If a fault is detected anywhere
in the boiler, boiler will lock out and display will show the fault
code as follows:
Red flashing display:
• The
symbol
• The "
RESET"
symbol
Descriptions of each error code are given in the table below.
To reset an error code, press
button for 2 seconds.
If the error code continues to display, search for the cause in
error table and follow instructions given in solution section.
Error Code Table
Error
Code
Description
Probable Causes
Checking/Solution
E00
Storage unit PSU parameter
not found
Bad connection
Check the wiring
E01
The safety parameters are
incorrect
Bad connection
PSU defective
Check the wiring
Replace PSU
E02
Supply temperature sensor
short circuited
Bad connection
Sensor fault
Sensor not/poorly connected
Check the wiring
Check sensors are operating correctly
Check sensor has been correctly fitted
Replace sensor if necessary
(CHART 1)
E03
Supply temperature sensor
open circuit
Bad connection
Sensor fault
Sensor not/poorly connected
Check the wiring
Check sensors are operating correctly
Check sensor has been correctly fitted
Replace sensor if necessary
(CHART 1)
E04
E05
Temperature of heat
exchanger too low.
Heat exchanger
temperature too high
Bad connection
Sensor fault
Sensor not/poorly connected
No circulation
Check the wiring
Replace sensor if necessary
Purge air in heating system
Check for water circulation (direction, pump, valves)
Check water pressure
Check sensors are operating correctly
Check sensors have been correctly fitted
Check cleanliness of heat exchanger
(CHART 1
E06
Return temperature sensor
short circuited
Bad connection
Sensor fault
Sensor not /poorly connected
Check the wiring
Check sensor has been correctly fitted
Check sensors are operating correctly
(CHART 1)
E07
Return temperature sensor
open circuit
Bad connection
Sensor fault
Sensor not /poorly connected
Check the wiring
Check sensor has been correctly fitted
Check sensors are operating correctly
(CHART 1
E08
E09
Return temperature too low
Return temperature too
high
Bad connection
Sensor fault
Sensor not/poorly connected
No circulation
Check the wiring
Replace sensor if necessary
Purge air from heating system
Check for water circulation (direction, pump, valves)
Check water pressure
Check sensors are operating correctly
Check sensors have been correctly fitted
Check cleanliness of heat exchanger
(CHART 1)
Note corresponding
troubleshooting charts for further
information (CHART xxx)
P/N 240011664, Rev. E [09/15/2017]