503
Thermo AC/DC
5 Troubleshooting
5.3
Error symptom “Total failure of the heater“
Is there a sufficiently high control
voltage?
Check the voltage converter (see
) or the control voltage source.
Check fuses in the control circuit and
if required remedy the fault and
replace fuse(s) (see
Eliminate the fault cause.
Replace fuse(s)
NO
YES
Is the HV over current protection
ok?
Eliminate the fault cause.
Reset ground fault interrupter or the
ISO guard.
Is the ground fault interrupter or
the ISO guard ok?
Check acc. to the vehicle manu-
facturer‘s instructions
Check load contactor (see
and replace load contactor if ne-
seccary.
Check water circuit on vehicle side.
Has the temperature limiter trigge-
red?
Eliminate the fault cause.
Reset temperature limiter.
Summary of Contents for Thermo AC 070
Page 47: ...memos...
