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Heating operation
T1 < T2
Pre-purge
PUMP ON
FAN ON
Fan Motor
Abnormal?
Fan RPM
stabilized ?
Ignitor On
Gas Valve ON
Flame Rod
Abnormal?
Ignitor Off
Burner Operation
Figure 89
Singular Combi Boiler - BTC 439003301 B (2021/07)
No
T1: Heating Temperature
T2: Setting the heating
Temperature
Yes
"A2" Error check
No
Yes
"A6" Error check
DHW operation
No
T3 < T4
T3: DHW Temperature
T4: Setting the DHW
Temperature
Pre-purge
PUMP ON
FAN ON
Yes
Fan Motor
"A2" Error check
Abnormal?
Yes
APS
"AE" Error check
Abnormal?
No
No
Fan RPM
stabilized ?
Ignitor On
Gas Valve ON
Yes
Flame Rod
"A6" Error check
Abnormal?
Ignitor Off
Burner Operation
Installation Instructions
| 57
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