Technical data

Thermo 230 / 231 / 300 / 301 / 350 9 Repair
901
9Repair
9.1 General
This section describes the repairs that may be performed
on the heaters Thermo 230, 231, 300, 301 and 350 when
removed. Any further disassembly will void the warranty.
For re-assembly only components of the proper spare part
kits are to be used.
WARNING
The igniter box operates on high voltage. The following
components may also be replaced with the heater
installed unless restricted space prevents access:
– temperature limiter
– temperature sensor
– combustion air fan
– burner
– igniter box
– flame sensor
– combustion chamber
Prior to replacement disconnect connectors of cable
harness in vehicle to avoid lethal accidents.
WARNING
Hot coolant may escape during the replacement of the
temperature sensor.
Before replacing the temperature sensor also release
pressure from cooling system by opening sealing
element.
If required also allow heater to cool down.