Table of Contents
Advertisement
WD420/3/2007
ERROR HISTORY
The Qudos 28s has an internal memory function that stores the last six errors
encountered along with the sensor readings at that time and the time elapsed between
each error occurring. This is very useful for diagnosing the cause of an error lockout,
particularly when the error is intermittent.
Press the "T T T T " button repeatedly until the display shows "SHE" and then press the
"ENTER" button, you will enter the Error History mode. Press the "S S S S " button to show the
error number to investigate (Er1 is the most recent and Er6 is the oldest). Having selected
the error press "ENTER". Press the "S S S S " to scroll through the readings stored at the time
of the lockout occurring. The table below shows the values associated with consecutive
"S S S S " button press:
No.
Meaning
Enn
The error code recorded for the lockout
2
Actual CH flow temperature (maximum 84C) - display indicates a radiator symbol
and a "1"
3
Actual CH return temperature (maximum 72C) - display indicates a radiator symbol
and a "2". (NB Flow temperatures more than 20C above return temperature may
lead to overheat and noise problems. Check the pump performance and the
system for blockages)
4
Actual DHW temperature - display indicates a tap symbol (NB Only relevant if the
DHW sensor option is connected)
5
Actual Flue Temperature - display indicates the flame and fan symbols (NB: Flue
temperatures above 75C may cause reduced boiler output. Flue temperatures
above 80C will cause boiler lockout)
6
System water pressure, in bar. (Maximum 2.7 bar, minimum 0.4 bar. The boiler will
shut down if the water pressure drops below 0.4 bar)
7
Outside temperature - display indicates a small graph on the bottom row. (NB: Only
relevant if an outside temperature sensor is detected)
8
Position in sequence:
0 - Initialise; 1 - Standby; 4 - Purge; 6 - Safety; 7 - Run; 8 - Postpurge;
9- Inter-Purge; 12 - Lockout
9
Time in hours since last error occurred
Installation & Servicing Instructions
Chapter 6 : Fault Finding
The Keston Qudos 28s & Qudos 28sP Boilers
Page : 34
Advertisement
Table of Contents
