INSTRUCTIONS FOR INSTALLATION
We reserve the right of alternations
Page
17
Boiler ''roars''
while heating
Check the
water pressure
and vent the
central heating
system
Defective immersion heaters
- change the heaters
YES
Please check the following
before going through fault
finding chart:
Check the installation is
correct.
All isolating valves are open.
The system is full of water
(pressurised) and purged of
air.
Programmer and controls
outside of boiler are on.
Check the electrical supply is
connected correctly and
present
Central heating
system was not
vented properly
Lower the speed on
central heating pump
(see guide below)
YES
NO
Changing the speed of pump for central heating
For Termo Blok and Termo Blok PTV, open the cover of boiler as described in chapter 4.4. and locate
central heating pump, use chapter 2.4. for assistance. Move speed slider (1) to desired mark. For
Termo Extra boilers external pump is fitted, consult pump manuals for guidance.
Selecting pump speed
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