MDC XT13 - 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 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:
o 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 because the fan did not
push enough air through the exhaust channel. A cause could be, e.g., blocking
of the exhaust channel 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 tem-
perature 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 incor-
rect 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/unplugged.
7
s,s,s,s,s,l,l,l
Error of burner MCU
internal RAM
Error detected in the burner MCU’s internal safety monitoring 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) detected 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.
20
s,s,s,l,s,l,s,s
Malfunction of water
inlet temperature sensor
WIT
Water inlet temperature sensor WIT
– has a short circuit or– is open/unplugged or
– the temperature of the sensor is colder than 14 °F (-10 °C).
21
s,s,s,l,s,l,s,l
Malfunction of circulation
line temperature sensor
WCT
Circulation line temperature sensor WCT
– has a short circuit or– is open/unplugged or
– the temperature of the sensor is colder than 14 °F (-10 °C).
22
s,s,s,l,s,l,l,s Malfunction of gas valve,
modulation section
Error at gas valve, modulation level, because
- the modulator has a short circuit or
- is open/unplugged.
23
s,s,s,l,s,l,l,l
Voltage is too high
The main power supply’s voltage detector measured a voltage level of >16.4 V.
24
s,s,s,l,l,s,s,s
Voltage is too high
The main power supply’s voltage detector measured a voltage level of <10 V.
25
s,s,s,l,l,s,s,l
Flue fan current con-
sumption error
The current detector for the flue fan has measured a current outside the
permitted limits.
26
s,s,s,l,l,s,l,s
Circulation pump current
consumption error
The current detector at the circulation pump has measured a current outside
the permitted limits.