AD83.70-W-6000-48A | AHE test of electrical system metering pump, temperature circuit breaker, control module and combustion air blower open circuit |
| Scope of test | Measuring instrument/ Test connection | Operation/Requirement | Specified value | Possible cause/Remedy | ||
1.0 | Metering pump, Temperature-controlled cutout, Control unit –//– Combustion air blower –//– Voltage supply Control unit (Z14) |
B4 | Z14 |
A4 | Ignition: OFF Heater unit: OFF Connect multimeter on plug A and plug B (both on control unit behind timer). Heater unit: ON Ignition: ON Observe measuring instrument approx. 10s after switching on heater unit. | 22.529.5 V | Value approx. 0 V: Replace control unit (Z14) on trial. Value in order: - If both fault codes re-appear: 1.1 - If no fault code appears: Inspect plug connections from control unit (Z14) to heater unit, possible loose contact: Erase fault memory. Then tap / shake plug connections, observing HHT display. Fault cause is located at the point where both fault codes re-appear. |
1.1 | Metering pump, Temperature-controlled cutout, Control unit –//– Combustion air blower –//– Supply cable Combustion air blower and metering pump (M16) |
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| FF8 14/5 | Ignition: OFF Heater unit: ON Carry out measurement at plug connection FF8. | 22.529.5 V | Value approx. 0 V: Plug connection / cable –//– Inspect plug connections, fit new cable if necessary (1.5 mm2, red). Value in order: 1.2 |
1.2 | Metering pump, Temperature-controlled cutout, Control unit –//– Combustion air blower –//– Supply cable Combustion air blower and metering pump (M16) |
14/14 | G |
14/5 | Ignition: OFF Heater unit: ON Carry out measurement at plug connection G under air recirculation box. | 22.529.5 V | Value approx. 0 V: Repair plug connection / cable to electrical compartment. Value in order: Check plug connection on heater unit, replace cable harness to heater unit if necessary. |