Spheros thermo 231, Workshop Manual

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3 Functional Description Thermo 230 / 231 / 300 / 301 / 350
306
Malfunctions during run-down:
Detection of a flame after more than 30 seconds after
start of run-down with the circulation pump and
combustion air fan only maintaining operation for the follo-
wing 90 seconds.
Malfunctions by overheating:
Overheating results in deactivation of the heater by the
temperature limiter/thermostat. Dependent on heater
configuration:
–
the reset button on the temperature limiter must be
reset.
– the reset of the thermostat is performed automatically
after cool down.
An error reset for a new start standby is achieved by
switching the heater off and on again.
Malfunctions by overheating of the burner
(Thermo 231 and 301):
Overheating of the burner causes the overheat thermostat
to initiate an error lockout at 150°C.
The solenoid valve closes, the fuel supply is cut off and a
run-down is launched. An auto-reset occurs after cool-
down of the thermostat.
3.9 Error Code Output (heaters with
control unit 1572D)
When equipped with a standard timer an error code
readout appears on the display of the timer after a
malfunction.
NOTE
When the heater is operated by means of a switch the
type of error is output during heater run-down via a flash
code of the operating indicator light. After five short
signals the long flash pulses are counted. The flash
pulses correspond to the error number in the following
table:
F 01 no start
F 02 flame-out *
F 03 low voltage or excess voltage
F 04 foreign light detected during run-up and run-down
F 05 flame sensor defective
F 06 temperature sensor defective
F 07 solenoid valve defective
F 08 fan motor defective
F 09 circulation pump defective **
F 10 temperature limiter defective / overheating
F 11 igniter box defective
F 12 error lockout due to repeated malfunction or
repeated flame-out
(8x no start-up or 5x flame-out)
* A response of the overheat thermostat will be stored
in the control unit as a flame-out (F 02) (
Thermo 231
and301 ).
** The error 09 is indicated only if the heater is equipped
with a circulation pump monitoring (see table below).
Table: Programmed SG1572D with integrated circulation
pump monitoring
EOL-Data record for SG 1572D
EOL-
Data record
Circulation pump monitoring
Ctr. device
programmed
Yes No
63317F
63860E
67980D
X 67981D
96774B
97805C
97807C
X 97810C
97809C X 97810C
97811B X 97812A
97813A
97815A