Technical Information
no.
912-100-0108
page
11/11
status: 14.07.05
Fault
Cause
Remedy
Heating will not
function
Vehicle engine is not
running
Start engine
Cooling water still
cold
Wait until the engine reaches operating
temperature
Water valve closed
Open valve
Water lines kinked or
squashed
Eliminate fault by installing correctly.
Water pump pressure
insufficient
Heat exchanger does not have cooling
water flowing through it. Install
additional pump or a more powerful
one.
Reduced heating
performance
Volumetric air flow
from blower is too
low
See action to take under “Blower”
Water flow rate
through heat
exchanger is too low
Water lines kinked or squashed. Relay
hoses. Water pump pressure too low
(See above for action)
Air in heat
exchanger
When the pumping pressure is sufficient
the heater is self bleeding. Install
additional or more powerful water
pump.
Unit is
underdimensioned
Provide about 1 kW of heating power
for each cubic metre of cabin air. Install
additional heating or a more powerful
unit
Water escaping from
the unit
Hose connection
has come loose
Check hose seatings and tighten hose
clamps
Water hose
damaged
Install and connect new hose
Heat exchanger
damaged
Install and connect original
replacement part. Warning! Follow
safety instructions!