Phase number
Display
Operating state
Description of function
STY
Standby (no heat demands)
Burner on stand-by
THL1
Fan start-up
Self-test for burner start and fan start-up
THL1A
TV
Pre-purging time
Pre-purging, fan deceleration time to starting load speed
TBRE
Waiting time
Internal safety tests
TW1
TW2
VDE
Ignition phase
Ignition and start of safety time for flame formation, ionisation
current build-up
TSA1
Safety time constant
Flame monitoring with ignition
TSA2
Safety time variable
Flame monitoring without ignition
TI
Interval time
Flame stabilisation
MOD
Modulating mode
Operating burner
THL2
Subsequent ventilation with last operating fan
speed
Fan continues to run
THL2A
Subsequent ventilation with pre-purging fan
speed
Fan continues to run
TNB
Burner shut-off delay
Permitted burner run-on time
TNN
Overrun time
Permitted fan run-on time
STV
Start prevention
No internal or external release exists (e.g. no water pressure,
lack of gas)
SAF
Safety switch-off
STOE
Fault position
The current fault mode is displayed.
10.3 Standard inspection and maintenance operations
10.3.1 Checking water hardness
The water hardness of the heating water has to be checked within the
scope of the recommended maintenance of the boiler and the
corresponding amount of additive has to be added if necessary.
10.3.2 Removing the burner
The following steps describe how to remove the burner:
1. Close gas shut off device
2. Remove front panel of the EC five.
3. Release ignition cable, ionization line and earthing cable.
4. Disconnect connection lines from fan and gas valve
10 Maintenance
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