During all active operating phases of the heater, all electric components, the operating
voltage and functional irregularities are monitored and recorded.
A malfunction causes the heater to terminate its operation by a fault shut-off and to go
into the fault lock-out mode to prevent the heater from an automatic combustion
restart. At the same time the operation indicator begins to flash with a specific code
(see below).
The fault lock-out occurs:
undervoltage or overvoltage during a defined period
if combustion was not established during start-up
if the flame extinguishes during operation
unexpected light detection
if the control device itself has failed or peripheral components are defective
Variants to reset the heater after a fault lock-out:
1. Switch off the heater and then turn it on again.
2. Reset the control device, e.g. through disconnecting it from the power supply.
Additional to the fault lock-out a heater lock-out occurs if safety related components are
affected.
The heater lock-out occurs:
overheat protection has been activated, is disconnected or defective
water temperature sensor is defective
solenoid valve is defective
flame guard is defective
repeated malfunctions (error counter has reached the locking threshold)
repeated flame interruptions (flame interruption counter has reached the
locking threshold)
control device malfunction or program error
If a heater lock-out has occurred, the heater must be maintained and released by
Spheros-trained personnel.
Malfunction
Thermo G
Operating and
Maintenance Instructions
Flash code
The kind of malfunction is indicated from the operating indication light through a flash
code, and if a standard timer is used, on the display (operating indication) respectively.
The flash code is immediately generated after detection of the malfunction and will be
kept while the heater is powered on until the heater is freed.
The flash code comprises of a burst (sequence) of 5 short flashes depicting the break and
a defined number of long pulses corresponding to the malfunction number, which are
to be counted. After that the cycle starts with 5 short flashes again and so on.
The meaning of the number of long pulses is shown in the table below.
Table: Flash codes
No. of
Long
Description of malfunction
pulses
0
Control Device malfunction (on standard timer 1531 not displayed)
1
No start within the safety time
2
Flame interruption during operation, repeated start unsuccessfully
3
Undervoltage / overvoltage
4
Unexpected light detection before starting or within the purge cycle
5
not assigned
6
Temperature sensor / overheat protection defective
7
Solenoid valve 1 or 2 defective (short circuit/disconnected/does not close)
8
Combustion air fan motor defective
9
Circulating pump defective
10
Overheat protection has been activated
11
Electronic ignition module defective (short circuit/disconnected)
12
Heater fault lock-out (caused by several malfunctions or flame
interruptions)
13
Electrical gas regulator heating defective
Subject to modification
