Buderus 800-24 Installation And Servicing Instructions page 54

5 Servicing
5.3.15 Checking the hot surface ignitor
Disconnect the system from the power supply.
Unplug the hot surface ignitor.
Measure the resistance of the hot surface ignitor at the
plug. If the resistance is less than 200 Ω, the hot surface
ignitor is in order.
Disconnect measuring device.
If the hot surface ignitor is working correctly, plug it in once
more.
Connect system to mains power supply.
5.3.16 Replacing the hot surface ignitor
Disconnect the system from the power supply.
Disconnect the plug-in cable.
Loosen fixing screws and remove hot surface ignitor.
Fit new hot surface ignitor and retighten fixing screws.
Plug in cable connection.
Connect system to mains power supply.
5.3.17 Checking the hose connection between the gas-air
injector and gas-valve assembly
Check hose connection for tightness and for signs of
possible blockages or damage.
Check that the hoses are correctly fitted to P1.
Hose connection:
P1 + , to T-piece gas-valve assembly.
Subject to modifications resulting from technical improvements !
54 Installation and servicing instructions condensing gas boiler 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • edition 02/2006
fig. 76 Checking the hot surface ignitor
fig. 77 Replacing the hot surface ignitor
fig. 78 Checking the hose connection between the gas-air injector
and gas-valve assembly (Honeywell gas units)
Buderus • http://buderus-domestic.co.uk