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5
Servicing
5.3.10 Replacing the hot water out flow sensor and the
hot water heat retaining sensor.
Disconnect the system from the mains power supply.
Disconnect the plug of the hot water out flow sensor
(fig. 86, item 1) or the hot water heat retaining sensor
(fig. 86, item 2).
Turn on the hot water faucet and wait until the water flowing
out is cold.
Turn off the the hot water faucet.
Turn off the main DHW valve.
Remove the spring clip(s) (see frame 148).
Remove the sensor(s) and replace with new ones.
Connect the plugs.
Turn on a warm water faucet.
Open the main DHW valve and purge of air.
Turn the warm water faucet off.
Reconnect the system to the mains power supply.
5.3.11 Checking the hot surface ingnitor
Checking the hot surface ingnitor.
Disconnect the boiler from the mains power supply.
Disconnect the plug (fig. 87, item 1) of the hot surface
ignitor.
Set multimeter to measuring VAC.
Connect the boiler to the mains power supply and set in
service mode (see subsection 2.1.2).
Check if you measure 120 VAC when the code "0C" is
visible in the display.
Disconnect the multimeter from the plug and set the
multimeter to measuring resistance.
Check if the resistance of the hot surface ingnitor is
between 50 -300 Ω (see frame 165).
Disconnect the boiler from the mains power supply.
Reconnect the plug to the hot surface ignitor.
Reconnect the boiler to the mains power supply.
To check the connection lead to the UBA:
Disconnect the boiler from the mains power supply.
Remove the UBA 3 (see subsection 5.3.2).
Disconnect the plug of the hot surface ignitor (fig. 87,
item 1).
Measure the resistance of the cable (see fig. 88).
Reconnect the plug of the hot surface ignitor.
Remount the UBA 3 and connect the boiler to the mains
power supply.
Subject to modifications resulting from technical improvements!
56
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
1
2
fig. 86 Disconnect plugs of hot water sensors
1
fig. 87 Disconnect plug of hot surface ignitor
fig. 88 Measuring resistance of hot surface ignitor
Boulter Buderus Ltd. • http://www.boulter-boilers.com
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