Diagnostic Flow Chart - Potterton Eurocondense Plus Installation Manual

DIAGNOSTIC FLOW CHART

Diagnostic flow chart
Water pressure > 0,5 bar
(switch closed)
Heat demand (DHW or CH)
NO
Gas pressure switch closed
3 – Pre-ventilation period
Correct fan speed
Gas pressure switch opens
5 – Flame detection
Appliance runs:
11 – DHW, 10 – CH
Flame detection
Heat demand satisfied
NO
20, 21 – Switch off,
diagnostic phase.
Fan continues to run
22 – Transition phase
MAINS OFF
Switch on
Diagnostics
0 – Stand-by
YES
YES
Heat demand
YES
2 – Fan starts
YES
5 – Ignition
YES
NO
YES
Ignition off
YES
YES
NO
Codes 0...22 refer to boiler operating phase; see tab. 6,
parameter A4 and table 5
"119" flashing in display.
NO
Automatic reset when pressure rises.
"132" flashing in display.
NO
Automatic reset when pressure rises.
"160" or "135" flashing in display.
NO
Manual reset necessary.
YES
"133" flashing in display.
NO
Retries 3 times, then lockout.
"134" flashing in display.
NO
Retries 3 times, then lockout.
Restart
49