MDC ROBSON XTT - Appendix A - Error Codes

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Appendix A - Error Codes
If the appliance malfunctions, LED 2 (refer to “Overview / Designation of parts” on page 2) will ash to indicate the
malfunction. There are short and long intervals of ashing. The ashing will repeat every 3 seconds.
1. Note the ashing 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 ame-detection error at the burner because the
ame 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 ue 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 ue fan is not running.
Cause is a defective EPS or ue 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 ame detection of the burner because
the ame 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.