Buderus 500 - 28/C Servicing Manual page 23

box 22
Is the turbine flow-meter working correctly (along with DHW temperature sensor of any external storage-type
step 20
water that might be fitted)?
Replace the turbine flow-meter, or DHW temperature sensor of any external storage-type water heater that
step 21
might be fitted.
Check the cable of the turbine flow-meter, see box 112, or cable of the DHW temperature sensor of any
step 22
external storage-type water heater that might be fitted.
Is the cable correctly connected and free of damage?
step 23
Replace the cable loom (or the affected part thereof).
step 24
Check to ensure that the boiler starts up to supply hot water, see box 15.
step 25
Does the boiler start up?
step 26
Interpret current display codes box 20 and deal with fault.
step 27
Check to ensure that the tap flow rate is correctly adjusted, see box 180.
step 28
Is the tap flow rate correctly adjusted?
step 29
Correctly adjust the tap flow rate, see box 180.
step 30
Is an internal 3-way valve fitted?
step 31
Check the movement of the servomotor of the Buderus 24V AC external 3-way valve, see box 211.
step 32
Does the servomotor of the Buderus 24V AC external 3-way valve move correctly?
step 33
Check the movement of the servomotor of the internal 3-way valve, see box 181..
step 34
Does the servomotor of the internal 3-way valve move correctly?
step 35
Check to ensure that the the Buderus 24V AC external 3-way valve has been fitted correctly,
step 36
see box 227.
Has the Buderus 24V AC external 3-way valve been fitted correctly?
step 37
Fit the Buderus 24V AC external 3-way valve in the correct way, see box 227.
step 38
Check the drive mechanism of the internal 3-way valve, see box 195.
step 39
Is the drive mechanism of the internal 3-way valve working correctly?
step 40
Replace the drive mechanism of the internal 3-way valve, see box 198.
step 41
Check the circulation for debris, see box 97.
step 42
Is there any debris in the pump?
step 43
Clean the pump, see box 97.
step 44
The following components must be checked for soiling and/or damage:
step 45
- combustion-air inlet pipework
- heat exchanger
- flue-gas pipework.
Are the above-mentioned components clean and free of damage?
step 46
Clean and/or replace the corresponding components.
step 47
We reserve the right to make technical modifications
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
Diagnosis
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Buderus Ltd. • http://www.buderus-domestic.co.uk
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