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Appendix A - Error Codes
If the appliance malfunctions, LED 2 (refer to “Overview / Designation of parts” on page 2) will flash to indicate the
malfunction. There are short and long intervals of flashing. The flashing will repeat every 3 seconds.
1.
Note the flashing intervals and check the list below.
2.
Reset the appliance:
-
Switch off the appliance. / – Wait 5 seconds / –Switch the appliance on again.
3.
If an error code is still displayed, contact an authorized Truma service center.
Error
Code
Flash Code
s =short = 0
l = long = 1
Error
Description
1
s,s,s,s,s,s,s,l
Flame not detected
There is a flame-detection error at the burner because the
flame was not de-tected after release of gas and ignition.
Important: The system indicates this error only after three
attempts at intervals of approximately 30 seconds.
2
s,s,s,s,s,s,l,s
Error at over temperature
switches (EOS, BOS)
The exhaust over temperature switch (EOS) or burner over
temperature switch (BOS) is open/unplugged.
3
s,s,s,s,s,s,l,l
Error at exhaust pressure
switch (EPS)
The EPS did not close when the flue fan was actuated be
-
cause the fan did not push enough air through the exhaust
channel. A cause could be, e.g., blocking of the exhaust chan
-
nel or a faulty switch.
OR
The EPS is closed even though the flue fan is not running.
Cause is a defective EPS or flue fan.
4
s,s,s,s,s,l,s,s
Error at water over
temperature switch (WOS)
The WOS opened at a water temperature of over 185 °F (85
°C).
5
s,s,s,s,s,l,s,l
Flame detected at incorrect
time
There is an error in flame detection of the burner because
the flame was detected
– before ignition or
– before the release of gas or
– after the gas was switched off.
6
s,s,s,s,s,l,l,s
Error in the safety circuit for
gas valve
There is a heating request but gas cannot be released.
One of the switches WOS, EOS, BOS, EPS is open/un
-
plugged.
7
s,s,s,s,s,l,l,l
Error of burner MCU internal
RAM
Error detected in the burner MCU’s internal safety monitor
-
ing feature (safety variables are no longer correct or RAM/
STACK was overwritten by mistake).
9
s,s,s,s,l,s,s,l
Malfunction of water outlet
temperature sensor WOT
Water outlet temperature sensor WOT
– has a short circuit or
– is open/unplugged.
10
s,s,s,s,l,s,l,s
Error in the safety circuit
There is a heating request but gas is not released because a
valve-actuation signal was not activated.
11
s,s,s,s,l,s,l,l
Error of MCU watchdog gas
release
There is a heating request but the MCU watchdog does not
release the gas path.
12
s,s,s,s,l,l,s,s
Internal error
13
s,s,s,s,l,l,s,l
Short circuit shut-off valve
Short circuit detection in the gas valve (shut-off part) detect
-
ed a current > 1000 mA and shut off.
16
s,s,s,l,s,s,s,s
Malfunction of the MCU
Internal error of the control unit.
Содержание ROBSON XTT
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