Appendix A - Error Codes - Truma AquaGo basic Operating Instructions Manual

APPENDIX A – Error Codes
If the Truma AquaGo™ instant water heater malfunctions LED 2 (refer to "Overview / Designation
of parts" on page 2) will blink to indicate the malfunction. There are short and long intervals of
blinking. The blinking will repeat every 3 seconds.
1. Write down the blinking intervals and check the list below.
2. Reset the Truma AquaGo™ instant water heater:
• Switch off the Truma AquaGo™ instant water heater.
• Wait 5 seconds.
• Switch the Truma AquaGo™ instant water heater on again.
3. If an error code is still displayed, contact an authorized Truma service center.
Error Blink code
code s =short = 0
l = long = 1
1 s,s,s,s,s,s,s,l
2 s,s,s,s,s,s,l,s
3 s,s,s,s,s,s,l,l
4 s,s,s,s,s,l,s,s
5 s,s,s,s,s,l,s,l
6 s,s,s,s,s,l,l,s
7 s,s,s,s,s,l,l,l
8 reserved
9 s,s,s,s,l,s,s,l
10 s,s,s,s,l,s,l,s
11 s,s,s,s,l,s,l,l
12 s,s,s,s,l,l,s,s
13 s,s,s,s,l,l,s,l
14 – 19 reserved
20 s,s,s,l,s,l,s,s
21 s,s,s,l,s,l,s,l
22 s,s,s,l,s,l,l,s
23 s,s,s,l,s,l,l,l
24 s,s,s,l,l,s,s,s
25 s,s,s,l,l,s,s,l
26 s,s,s,l,l,s,l,s
27 s,s,s,l,l,s,l,l
24
Error
Flame not detected
Error at over temperature
switches (EOS, BOS)
Error at exhaust pressure
switch (EPS)
Error at water over tem-
perature switch (WOS)
Flame detected at incor-
rect time
Error in the safety circuit
for gas valve
Error of burner MCU
internal RAM
Malfunction of water
outlet temperature sensor
WOT
Error in the safety circuit
Error of MCU watchdog
gas release
Internal error
Short circuit shut-off valve Short circuit detection in the gas valve (shut-off part) detected a current
Malfunction of water inlet
temperature sensor WIT
Malfunction of circulation
line temperature sensor
WCT
Malfunction of gas valve,
modulation section
Voltage is too high
Voltage is too low
Flue fan current con-
sumption error
Circulation pump current
consumption error
Water circulation pump is
running dry.
Description
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 inter-
vals of approximately 30 seconds.
The exhaust over temperature switch (EOS) or burner over temperature
switch (BOS) is open/unplugged.
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 defec-
tive EPS or flue fan.
The WOS opened at a water temperature of over 185 °F (85 °C).
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.
There is a heating request but gas cannot be released.
One of the switches WOS, EOS, BOS, EPS is open/unplugged.
Error detected in the burner MCU's internal safety monitoring feature (safety
variables are no longer correct or RAM/STACK was overwritten by mistake).
Water outlet temperature sensor WOT
– has a short circuit or
– is open/unplugged.
There is a heating request but gas is not released because a valve-actuation
signal was not activated.
There is a heating request but the MCU watchdog does not release the gas
path.
> 800 mA and shut off.
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).
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).
Error at gas valve, modulation level, because
- the modulator has a short circuit or
- is open/unplugged.
The main power supply's voltage detector measured a voltage level of >16.4 V.
The main power supply's voltage detector measured a voltage level of <10 V.
The current detector for the flue fan has measured a current outside the per-
mitted limits.
The current detector at the circulation pump has measured a current outside
the permitted limits.
The circulation pump does not generate water flow. The water system may
not be filled or not sufficiently vented.
The circulation pump tries to generate a water flow every 30 s (if successful,
the error is reset).