49
DIAGNOSTIC FLOW CHART
Diagnostic flow chart
MAINS OFF
Switch on
Diagnostics
Water pressure > 0,5 bar
(switch closed)
D
D
D
D
D
YES
Heat demand (DHW or CH)
D
YES
YES
Heat demand
Gas pressure switch closed
2 – Fan starts
D
D
D
YES
D
3 – Pre-ventilation period
D
Correct fan speed
5 – Ignition
D
NO
YES
D
Gas pressure switch opens
YES
YES
YES
D
5 – Flame detection
D
Ignition off
D
D
D
NO
D
20, 21 – Switch off,
diagnostic phase.
Fan continues to run
“
134
“
flashing in display.
Retries 3 times, then lockout.
A
B
NO
0 – Stand-by
A
A
NO
Appliance runs:
11 – DHW, 10 – CH
Flame detection
22 – Transition phase
NO
“
133
“
flashing in display.
Retries 3 times, then lockout.
A
A
NO
Restart
A
A
YES
A
A
“
160
“
or
“
135
“
flashing in display.
Manual reset necessary.
A
NO
“
132
”
flashing in display.
Automatic reset when pressure rises.
A
A
NO
“
119
“
flashing in display.
Automatic reset when pressure rises.
A
A
NO
Heat demand satisfied
Codes 0
…
22 refer to boiler operating phase; see tab. 6,
parameter A4 and table 5
Содержание EC Plus 120
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