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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Troubleshooting
Fault Messages
(continued)
Repairs
(continued)
Removing the hydraulic unit
If components of the hydraulic unit have to be
replaced.
Close the gas shut-off valve and secure against
unintentional reopening.
Isolate the system from the power supply, e.g. by
removing the separate fuse or by means of a mains
isolator, and check that it is no longer live.
Safeguard the system against reconnection.
Wear suitable personal protective equipment when
carrying out any work.
Electronic assemblies can be damaged by electrostatic
discharge.
Before beginning work, touch grounded objects, such
as heating or water pipes, to discharge any static.
Disconnect all water and gas connections.
1. Shut off and drain the boiler on the heating water
and DHW sides.
2. Undo screws.
3. Remove plate heat exchanger.
Note: During and after removal, small amounts of
water may trickle from the plate heat exchanger.
4. Remove gaskets and dispose of them.
5. Check connections on the DHW side for scaling.
Clean or replace the plate heat exchanger as required.
6. Check connections on the heating water side for
contamination. Clean or replace the plate heat
exchanger as required.
7. Install plate heat exchanger in reverse order using
new gaskets.
Screw torque: 28 lb.in ± 2 (3.2 Nm ± 0.2)
Note: During installation, ensure the connections are
positioned and the gaskets seated correctly.
IMPORTANT
WARNING
Risk of electric shock from escaping heating water or
DHW.
Check all water side connections for tightness.
WARNING
Hot surfaces and media can cause burns or scalding.
Before maintenance and service work, switch
off the boiler and let it cool down.
Never touch hot surfaces on the boiler, burner,
flue system or pipework.
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