Keston Thermomatic RSM20/FB, Installation & Servicing Instructions Manual, Page: 30 / 46

Page 30
Fig. 7.10. CONDITION 10.
On summer mode, do the
radiators get hot?
Is the summer / w inter sw itch (SWS)
on "w inter mode"
Clean or replace it.
Is SWS faulty?
Is the non return valve dirty or
faulty?
No
Replace it.
Sw itch it to "summer
mode"
Is the circulation pump
w orking?
Yes Yes
Yes
Yes
Yes
No
Fig. 7.11. CONDITION 11.
A complete cleaning is
necessary.
Wrong fitting of the flue pipe or
of the air intake pipe?
Gas products smell?
Are the fire tibes of the heat
exchanger and the baffles dirty?
Wrong installation of the flue
pipe unit?
Obstruction of the flue pipe
terminal?
Remove the flue pipe unit,
clean it and fit it properly to the
boiler.
Remove it. Fit properly and air tight
to the boiler according to the
installation manual.
Remove the obstruction and
leave the terminal clean.
Yes Yes
Yes
Yes
Yes
No
No
No