E
RRORS
G
AS
-
FIRED
AIR
HEATER
en-40
en
Gevaar:
d
All work on the inside of the unit may only be
carried out by personnel who are technically
qualified to do so.
Opmerking:
n
In the event of malfunctions, always contact Biddle.
Lock-out errors
CODE MEANING
PROBABLE
CAUSE
WHAT
TO
DO
A / 0 Internal error
Faulty circuit board
Replace the circuit board
A / 1 Flame detection
error
No flame
• Check the gas pressure.
• Check the gas/air mixture and the setting
of the gas valve.
• Check the power supply to the gas valve.
• Check whether the ignition electrode is
producing a spark.
Flame keeps going out.
• Check the ionisation electrode and the
cabling. (The resistance of the ignition cable
is approx. 1 kOhm.
• Check the earth connection of the unit.
• Check the control system.
A / 2 Heat exchanger too
hot.
The heat exchanger has
become too hot.
• Check the fans.
• Check the settings of the gas valve.
A / 3 Sensor error
The two internal temperature
sensors are differing too
much.
• Turn the sensor a quarter turn, so that the
temperature is measured at a different
point.
• Measure the resistance of each sensor. This
should be 20K at 25° and 25K at 20°.
Replace the resistor if it differs too much
from this.
A / 4 Ionisation protection
Flame goes out often.
• See actions listed under error A / 1
• Check the earth connection of the unit.
• Check the settings of the gas valve.
• Check the flue gas channel for blockages.
A / 5 Internal error
Faulty circuit board
Replace the circuit board.
A / 6 Safety relay error
The safety relay does not
switch.
• Check plug J4.
• Check the bridge between contacts 5 and
11.
• Replace the circuit board.
A / 7 Flame protection
A flame is being falsely
detected.
Check the ionisation plug and the cables.
