Servicing Manual User Guide; Servicing Manual Gas Condensing Boiler Buderus 500-24/S, 500-24/C And 500-28/C • Issued - Buderus 500 - 28/C Servicing Manual

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Servicing manual user guide

2 Servicing manual user guide
box 9
This document consists of various sections. These in turn
contain subsections/boxes in the form of text or tables.
Subsections/boxes inside text and tables are identified by a
small grey box. Each subsection/box is assigned its own
identification number.
These subsections/boxes are divided into operating steps.
If an operating step involves the taking of a yes/no decision,
the right-hand side of the table indicates which subsection /
operating step you should proceed (cross reference).
Section
6 Diagnosis
box 24
step 28 Check the actuation of the servomotor of the internal three-way valve, see box 186.
step 29 Does the servomotor of the internal three-way valve start up correctly?
step 30 Replace the servomotor of the internal three-way valve, see box 191.
step 31 Check the power supply cable of the internal three-way valve, see box 192.
step 32 Is the power supply cable of the internal three-way valve in good condition?
step 33 Replace the cable loom (or the affected part thereof).
step 34 Check the movement of the servomotor of the Buderus 24V AC external three-way valve,
see box 212.
step 35 Does the servomotor of the Buderus 24V AC external three-way valve operate correctly?
step 36 Check to ensure that the the Buderus 24V AC external three-way valve has been fitted correctly,
see box 228.
step 37 Has the Buderus 24V AC external three-way valve been fitted correctly?
step 38 Install the Buderus 24V AC external three-way valve correctly, see box 228.
step 39 Check to ensure that the Buderus 24V AC external three-way valve is actuated correctly,
see box 213 and box 229.
step 40 Does the Buderus 24V AC external three-way valve actuate correctly?
step 41 Replace the servomotor of the Buderus 24V AC external three-way valve, see box 218.
step 42 Check the wiring of the Buderus 24V AC external three-way valve, see box 221.
step 43 Is the wiring of the Buderus 24V AC external three-way valve in correct condition?
step 44 Replace the wiring of the Buderus 24V AC external three-way valve.
step 45 Check the drive mechanism of the Buderus 24V AC external three-way valve, see box 222.
step 46 Is the drive mechanism of the Buderus 24V AC external three-way valve working correctly?
step 47 Replace the internal components of the Buderus 24V AC external three-way valve, see box 225.
step 48 Check the wiring of the Buderus 24V AC external three-way valve between the connection box or
moving plug-and-socket connection and the control panel as per box 288.
box 25
On combi boiler supply: hot water available, but no heating operation.
On system boiler supply: no heating operation.
Hot water may be available, but no heating operation.
step 1 Check to ensure that the power supply cable to the RTH converter/Junction box has been installed correctly,
see box 286.
step 2 Is the 230V connection to the RTH converter/Junction box fitted correctly?
step 3 Correctly attach the switch live to terminal 1 and Neutral to terminal 2 on the 230V connector, see box 286.
step 4 Disconnect black leads from terminals 1 & 2 on the back of the DBA and test for continuity between the two
leads.
No continuity check S/L and N connections are made correctly and that there is 230v between the two.
Replace RTH converter/Junction box.
Continuity reconnect the cables to terminals 1 & 2 and check the connections between the terminals and
the DBA.
We reserve the right to make technical modifications
24 Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2005
Operating step number
Explanation of this subject starts in this box.
The following boxes can be relevant as well.
We reserve the right to make technical modifications
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Cross reference to subsection
or operating step
Subsection/box
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Buderus Ltd • http://www.buderus-domestic.co.uk
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
step 30
step 31
box 43
box 42
step 33
box 43
step 36
step 39
step 45
step 38
box 43
step 41
step 42
box 43
step 47
step 44
box 43
box 42
step 47
box 43
step 4
step 3
box 43
Buderus Ltd. • http://www.buderus-domestic.co.uk