MDC XT16HR Series - Troubleshooting

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– 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 consumption
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.
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 55).
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 68) 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 62).
Hot water tem-
perature 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 appliance.
The appliance must be decalcified (refer to
“Decalcification” on page 62).
Water pressure in water system too
high.
Adjust the water pump pressure to a maximum
of 65 psi (4.5 bar).