Scania trucks are renowned for their robustness and dependability, especially in challenging weather conditions. One feature that contributes to their reliability is the auxiliary heater system, which keeps the cabin warm and assists with engine preheating. However, like any complex system, issues can arise, such as the flame monitor error. This article provides a step-by-step solution for resolving flame monitor errors in Scania truck auxiliary heater systems.
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The flame monitor is a critical component of the auxiliary heater that detects whether the flame necessary for heating is present. When a flame monitor error occurs, it indicates that the flame has been extinguished unexpectedly during operation, which can happen in various modes including MAX, HIGH, INTERMEDIATE, and LOW positions.
Common Error Identifications and Solutions
ATA 153 – MAX Position Flame Disappearance
Cause: The flame disappears when the temperature exceeds 90°C in MAX mode.
Solution:
1. Inspect the exhaust pipe for blockages that may restrict the combustion air fan.
2. Examine the combustion chamber for any obstructions or damage.
3. Verify the fuel supply to ensure it is consistent and unobstructed.
4. Check the flame monitor for functionality.
5. Test the glow plug’s resistance, which should read 2 +/- 0.2 ohms.
ATA 154 – HIGH Position Flame Disappearance
Cause: The flame disappears when the temperature exceeds 90°C in HIGH mode.
Solution: Follow the same steps outlined for ATA 153, as the causes and remedies are similar for both MAX and HIGH positions.
ATA 155 – INTERMEDIATE Position Flame Disappearance
Cause: The flame disappears when the temperature is above 90°C at ATA 1 or 85°C at ATA 2 in INTERMEDIATE mode.
Solution: The troubleshooting steps are identical to those for ATA 153 and ATA 154. Conduct a thorough check of the fuel supply, exhaust pipe, combustion chamber, flame monitor, and glow plug.
ATA 156 – LOW Position Flame Disappearance
Cause: The flame disappears when the temperature exceeds 95°C at ATA 1 or 80°C at ATA 2 in LOW mode.
Solution: As with the previous errors, ensure the fuel supply, exhaust pipe, combustion chamber, and flame monitor are all in good condition, and check the glow plug’s resistance.
ATA 164 – Prohibited Voltage Level Error
Cause: An open circuit in the flame monitor circuit is detected.
Solution: Investigate the flame monitor circuit for any open connections or damage. Repair or replace components as necessary.
ATA 165 – Prohibited Voltage Level Error
Cause: A short circuit in the flame monitor circuit is indicated.
Solution: Similar to ATA 164, check the flame monitor circuit, but look for signs of a short circuit. Address the issue by repairing or replacing affected parts.
Final Steps
After addressing the specific causes for each error, it is crucial to follow the detailed checking procedures as described in the work description within Scania’s Multi under 18-90 “H13, ATA Auxiliary heater – air.” This will ensure that all components are functioning correctly and that the auxiliary heater system is operating efficiently.
In conclusion, resolving flame monitor errors in Scania truck auxiliary heater systems involves a systematic approach to diagnosing and fixing potential issues with the fuel supply, exhaust pipe, combustion chamber, flame monitor, and glow plug. By following the prescribed actions and consulting Scania’s detailed work descriptions, operators can ensure their trucks remain reliable and ready to face the challenges of the road, no matter the weather conditions.
For more information about Scania truck,please refer to:Scania Trouble Repair.