AD83.70-D-4000F | Auxiliary heater (AHE) diagnosis fault memory | 21.7.98 |
MODEL 901.###, 902.###, 903.###, 904.### ## as of 753731 as of 3.11.97 with CODE (H11) Warm air auxiliary heater
Heater designation B3L-C compact,
Heater designation D3L-C compact
Danger! | Risk of explosion due to fuel vapors, risk of poisoning from inhaling combustion gases and risk of injury from burns during or after heater operation | Do not start stationary heater/auxiliary heater with engine booster in confined spaces or while refueling. Allow heater to cool down after operation and wear safety gloves. | |
Auxiliary heater (AHE) diagnosis, previous knowledge | |||
I | Battery voltage > 10.5 volts | ||
II | Auxiliary heater complete (all connectors connected) | ||
III | Connect Hand-Held Tester (HHT) | ||
IV | Ignition and auxiliary heater all switched on | ||
| Cables, plugs and connectors are also taken into account during testing with the HHT and, if a fault is displayed, may have to be checked again separately in accordance with the relevant electric wiring diagram for open circuit, good contact and correct connection | ||
Fault memory | |||
Fault code | Fault text (HHT) | Possible cause / remedy | |
| Control module fault | Replace control module | |
| Control module fault, internal temperature sensor | Replace control module | |
| Does not start | Check fuel supply, glow plug and flame sensor | |
| Too many attempts at starting | Failure to start 10 times in succession (refer to code ) | |
| Flame goes out | Check fuel supply and quantity of fuel If combustion is in order, check flame sensor | |
| Overvoltage | Check regulating voltage | |
| Undervoltage | Check fuse F9. Check battery and regulating voltage. Check electric cables (voltage drop) | |
| Premature flame recognition | Check flame sensor | |
|
| Flame sensor –//– | Check flame sensor and replace if necessary | |
|
| Metering pump –//– | Check metering pump and replace if necessary Check electrical cables and connections | |
| Incorrect blower motor speed | Check blower motor, replace blower if necessary | |
|
| Glow plug –//– | Check glow plug, replace if necessary Check electrical cables and connections | |
| Overheating | Check hot air pipe inlet and outlet for obstruction, remove obstruction if necessary Check overheating sensor | |
| Frequent overheating | Check hot air pipe inlet and outlet for obstruction, remove obstruction if necessary Check overheating sensor Check flame sensor | |
|
| Potentiometer –//– | Check heater timer connections and replace timer if necessary | |
|
| Overheating sensor –//– Outside tolerance | Check overheating sensor and replace if necessary |