THERMAFLOW LTD | THERMAFLOW® ELECTRIC COMBINATION BOILER |
Tel: 0870 850 5207
3.1.2 Fault: No central heating, but hot water at taps
29
Is there continuity through 2
nd
stage and 3
rd
stage master
high limit manual re-set safety thermostat?
No
Re-set or replace Thermostat
Is there continuity through contactor?
No
Replace Contactor
Is there ~230-240V at each heating element and
continuity through thermostats within?
No
Replace as necessary
Are external controls calling for heat?
No
Adjust the setting
Is temperature above setting on aqua stat?
(Should be set to
25
o
C
)
No
Re-check when temperature increases
Check thermostat and lock shield Valves on radiators are
open & calling for heat
Is there ~230-240V and continuity at terminals of the
aqua stat?
No
Check ~230V Supply
Is pump impeller turning?
No
Spin impeller or replace central heating
pump
Is there ~230-240V supply at central Heating pump?
No
Check for faulty external controls
Is the off peak control in the on position?
No
Yes
Turn on both channels
Is there continuity through low pressure switch?
No
Yes
Replace low pressure switch
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
