Table of Contents
Advertisement
8. Troubleshooting
Control system sequence
Status Sub-status Operation
0
0
Boiler stopped
1
1
Anti-short cycle activated
2
Reversal valve opening
3
Start-up of the boiler pump
4
Awaiting burner start-up
2
10
Open gas valve (External)
11
Fan start-up
13
The fan switches to the burner start-up speed
14
Check RL signal (Function not active)
15
Burner on switch request
17
Pre-ignition
18
Ignition
19
Check flame presence
20
Awaiting further action to unsuccessful ignition
3 / 4
30
Burner lit and free modulation on the boiler instruction
31
Burner lit and free modulation on a limited instruction, equal to a return temperature of +25°C
32
Burner ignited and free modulation on the boiler set point but output restricted
33
Burner lit and descending modulation following too large a rise in temperature on the exchanger (4 K in
10 seconds)
34
Burner lit and minimum modulation following too large a rise in temperature on the exhanger (7 K in 10
seconds)
35
Burner off following too large a rise in temperature on the exchanger (9 K in 10 seconds)
36
Burner lit and ascending modulation to guarantee a correct ionization current
37
Heating: Burner lit and minimum modulation after a burner start-up lasting 30 seconds
DHW production: Burner lit and minimum modulation after a burner start-up lasting 100 seconds
38
Burner lit and modulation fixed higher than the minimum after burner start-up lasting 30 seconds, if the
burner was off for more than 2 hours or after powering up
5
40
The burner will stop
41
The fan switches to post-sweeping speed on the burner
42
The external gas valve closes
43
Post-sweeping
44
Stop fan
6
60
Post-operation of the boiler pump
61
Stop boiler pump
62
Reversal valve closure
63
Start anti short cycle
8
0
Stand-by
1
Anti-short cycle activated
9
--
Blockage: The sub-status shows the error value
10
--
Blocking
16
--
Antifreeze protection
17
--
Bleed
120
8.6.1.
Control system sequence
MCA 35
15/06/12 - 300022160-001-01
Advertisement
Table of Contents
