Overheating of the
heat exchanger
The sensor sends a signal to shut down the
heater. Heat exchanger temperature in the
sensor zone is over 250°C
Check the intake and outlet of the heating unit for
unobstructed entry and exit of heated air.
Check the integrity of the fan and its performance.
Check the temperature sensor and replace it if necessary.
Inspect the heat exchanger.
Check and remove carbon deposits from the inside of the
heat exchanger, if necessary
Possible overheating
at the intake
temperature sensor.
Sensor temperature
(control unit) is more
than 55 degrees.
Control unit is insufficiently cooled down
during 5 min. purging before start-up; or
overheating of the control unit during
operation.
Check the intake and outlet of the heating unit for
unobstructed entry and exit of air and re-start the heater
to cool it down.
Replace the control unit.
Faulty temperature
sensor (AIR-2D) or
flame indicator
Short circuit to the casing or open circuit in
the wiring of the sensor.
Check sensor, replace if necessary
Faulty temperature
sensor in the control
unit
Temperature sensor out of order (located in
the control unit, cannot be replaced)
Overheat sensor -
open circuit
Faulty sensor. Oxidation of contacts in the
terminal block.
Check overheat sensor circuit for an open. Remove
oxidation from the connector contacts.
Short circuit, open circuit, faulty control
unit.
Check glow plug, replace if necessary.
Check the control unit, replace if necessary.
Electric motor of the
air blower does not
develop the necessary
speed.
Increased friction in the bearings or contact
between the impeller and fan shroud in the
blower.
Faulty electric motor.
Check electric motor, if possible correct the fault; replace
air blower if necessary
Faulty air temperature
sensor (intake) only
for AIR-8D.
Mechanical fault.
Oxidation of contacts in the block.
Shut down,
overvoltage more than
30V (for 24V) or more
than 16V (for 12V).
Faulty voltage regulator.
Faulty battery.
Check battery terminals and wiring.
Check the battery, charge it or replace if necessary.
Shut down, low
voltage, less than 20V
(for 24V) or less than
10V (for 12V)
The heater does not
start - two automatic
start attempts failed.
Fuel grade does not match the operating
conditions at low temperatures.
Replace fuel, see Annex 1.
Insufficient supply of fuel.
Eliminate fuel line leakage or blockage. Check the
performance of the fuel pump, replace if necessary
Clogged exhaust duct or combustion air
intake.
Clean air intake or exhaust duct of possible clogging.
Insufficient pre-heating of the glow plug,
faulty control unit.
Check the plug, replace if necessary.
Check voltage supplied by control unit, replace if
necessary.
The impeller touches the
the fan shroud in the blower, and, as a result,
flow of air into the combustion chamber is
reduced.
Replace blower after determining its malfunction.
The glow plug housing in CC is clogged.
Clogged glow plug screen or it is not
installed all the way into housing.
Clean the glow plug hole. Replace the glow plug screen, if
needed, and install it in accordance with repair manual
To Next Page
Loading...
