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Truma Combi G comfort / comfort plus
6
Troubleshooting guide
6.1
Troubleshooting guide for furnace
Fault
Furnace cannot be switched
on
Possible causes of faults and instructions for furnace troubleshooting are described in the operating instructions of
the installed control panel�
6.2
Troubleshooting guide for water supply
Fault
Water taking an extremely long
time to heat up
Water draining out – water
container cannot be filled
Water container cannot be
emptied, although the pressure
relief / drain valve is open
Water dripping / flowing from
the drainage socket of the
pressure relief / drain valve
6.3
Troubleshooting guide for fuel supply
Fault
Large amounts of smoke at
the wall cowl for significantly
more than 1 minute after the
device is started�
If these actions fail to remedy the fault, please contact Truma Service�
34020-01601 · 00 · 04/2024
Cause
Fuse blown
Overheating protection switch trig-
gered
Cause
Water container scaled up
Pressure relief / drain valve open
Pressure relief / drain valve drainage
socket blocked
Water line frozen
Water pressure too high
The pressure inside the water con-
tainer rises above a water pressure of
approx� 65�25 psi (4�5 bar) – pressure
relief / drain valve installed
Water pressure in the water system is
too high
Lime or dirt under the pressure relief /
drain valve seat
Cause
Fault in the fuel supply, improper instal-
lation, combustion air inlet restricted�
Remedy
Change fuse, see
"8�1 Fuses" on page 12
Reset overheating protection switch,
see "8�1�3 120 V AC overheating pro-
tection" on page 13
Remedy
Descale water system (see mainte-
nance)
Close pressure relief / drain valve
Check opening for dirt (slush, ice,
leaves etc�) and remove if necessary
Thaw water line
Check pump pressure (max� 2�8 bar)�
If the system is connected to a central
water supply (city water), install a pres-
sure reducer to prevent pressures high-
er than 2�8 bar in the water container
The pressure relief / drain valve pro-
tects the water container against
a pressure greater than 65�25 psi
(4�5 bar)� If the condition continues,
contact Truma service
Replace the water pressure reducer at
the fresh water supply� This must be
performed only by a qualified service
technician
Rinse the pressure relief / drain valve to
remove contamination from the valve
seat (see "8�3 Shutting down for winter
storage" on page 13)�
Replace the pressure relief / drain
valve� This must be performed only by
a qualified service technician�
Remedy
Fire hazard� Stop using the device�
Contact customer service
Troubleshooting guide
EN
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