MDC XT13 - Page 82

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27
s,s,s,l,l,s,l,l
Water circulation pump is
running dry.
The circulation pump does not generate water flow. The water system may not
be filled or not sufficiently vented.The circulation pump tries (20 times) to
generate a water flow every 30 s (if successful, the error is reset).
28
s,s,s,l,l,l,s,s
Too low gas pressure.
Gas supply (in vehicle) to the appliance insufficient.
29
s,s,s,l,l,l,s,l Too high heat power
required.
You are trying to use more hot water than the appliance can supply.
30
s,s,s,l,l,l,l,s
Risk of freezing.
Temperature in the appliance below 27 °F (3 °C).
31
s,s,s,l,l,l,l,l
Decalcification finished.
32
s,s,l,s,s,s,s
Current too low.
Current in the antifreeze kit too low (e.g. cable break).
33
s,s,l,s,s,s,s,l
Current too high.
Current in the antifreeze kit too high (e.g. short circuit).
Troubleshooting
Problem
Potential Cause
Resolution
No hot water
at the faucet
Gas supply is turned off or inter-
rupted.
Check and/or turn on gas supply.
Gas tank is empty.
Refill/replace the gas tank.
The appliance is switched off.
Switch on the appliance according to instructions (refer to “Operating
procedures” on page 54).
Fresh water supply is turned off.
Open the fresh water supply.
Power supply to the appliance is
switched off.
Switch on power supply to the appliance.
Defect in the appliance.
LED 2 flashes red (refer to “APPENDIX A – Error Codes” on page 37) and
contact a certified service technician if necessary.
Boiling noises Too much lime scale in the
AquaGo instant water heater.
The appliance must be decalcified (refer to “Decalcification” on page 17).
Hot water
temperature
too low.
Gas flow to the appliance is too
low (gas inlet pressure < 10.5 in.
wc).
Consult vehicle documentation to determine if the gas supply is capable of
providing the necessary volume of gas for the appliance.
Contact a service technician to verify that the gas installation is suitable.
Volume flow of hot water is too
high and/or the temperature of
cold water reaching the
appliance is too low.
Turn down hot water at the faucet or in the shower in order to reduce flow
rate.
Potentially retrofit a flow rate throttle in the water system. This must be
performed by a certified service technician.
Too much lime scale in the appli-
ance.
The appliance must be decalcified (refer to “Decalcification” on
page 17
).
Water
escaping at
pressure relief
valve.
Water pressure in water system
too high.
Adjust the water pump pressure to a maximum of 65 psi (4.5 bar).
If the water system is connected to a central water supply higher than 65
psi (4.5 bar) (rural or urban connection), a pressure reducer must be used.
Install a pressure reducer (e.g. Truma pressure reducer) at the fresh water
supply.
Water cannot expand in the
water system.
Contact the vehicle manufacturer about retrofitting a pressure
compensation element.
Lime or dirt under the pressure
relief valve seat.
Allow the appliance to cool and then slowly raise the test lever (Fig. 3 – 4a)
to flush the water system and attempt to force dirt or foreign matter out of
the pressure relief valve seat.
Replace pressure relief valve. This must be performed by a Truma certified
service technician.
Water
escaping at
water inlet
filter
Lime or dirt under the O-ring
seats.
Clean the O-rings and their corresponding sealing surfaces with clean
water.