DeNOx
7 Service and repair
This chapter contains information on troubleshooting and correction should an error occur during operation.
Repairs to the unit must be performed by Bühler authorised personnel.
Please contact our Service Department with any questions:
Tel.: +49-(0)2102-498955 or your agent
If the equipment is not functioning properly after correcting any malfunctions and switching on the power, it must be inspected
by the manufacturer. Please send the equipment inside suitable packaging to:
Bühler Technologies GmbH
- Reparatur/Service -
Harkortstraße 29
40880 Ratingen
Germany
Please also attached the completed and signed RMA decontamination statement to the packaging. We will otherwise be unable
to process your repair order.
You will find the form in the appendix of these instructions, or simply request it by e-mail:
7.1 Troubleshooting
CAUTION
Risk due to defective device
Personal injury or damage to property
a) Switch off the device and disconnect it from the mains.
b) Repair the fault immediately. The device should not be turned on again before elimination of the failure.
Problem / malfunction
Possible cause
Action
No or reduced gas flow
• Filter element plugged
• Clean or replace filter element, clean
sampling tube
Temperature alarm
• Heat-up not yet completed
• Wait for heat-up to complete
• Pt100 defective
• Send in probe for repair
• Heater / controller defective
• Send in probe for repair
No heat output / no display
• No / incorrect voltage
• Power supply
• Controller defective
• Send in probe for repair
Condensate or salt collecting inside
the probe
• Heater defective
• Send in probe for repair
• Thermal bridges at the sampling point
• Insulate to eliminate thermal bridges
Error messages on the display
Error 01
• Probe temperature too high, line Pt100
disconnected
• Check Pt100 connection inside the con-
troller or send probe in for repair
Error 02
• Probe temperature too low, Pt100 short-
circuit
• Send in probe for repair
Error 03
• Heated adapter temperature too high,
line Pt100 disconnected
• Check Pt100 connection inside the con-
troller or send probe in for repair
Error 04
• Heated adapter temperature too low,
Pt100 short-circuit
• Send in probe for repair
Tab. 1:
Troubleshooting
32
Bühler Technologies GmbH
BX460035 ◦ 08/2017
