IDEAL EVOMAX 2 80, Installation And Servicing

Page: 70 / 80

Is there a 230V on SL2 input
If a tank thermistor is configured and
fitted in place of a cylinder thermostat,
check the connection continuity and
thermistor
R(25ºC) = 10,000
Ω
Is the resistance correct?
Is an OpenTherm device connected
to the boiler (note that the Ideal
programmable room stat is an
OpenTherm device)?
Does the system hav a DHW pump or
diverter valve?
Is the boiler correctly set for a DHW
pump or diverter valve?
Is the DHW circuit set for day or in
a timed (on) period, or if it has an
OpenTherm device connected adn
configured for DHW check that it is
calling for DHW.
Check the control signal for the pump
depending on the configuraiton.
1. 230V supply from isolate or boiler MFR
2. Volts free enable from MFR
3. 0-10V signal from boiler 0-10V output
(Rectify fault as required)
There is no voltage from the timer/cylinder stat. This
is not a boiler fault. Ensure voltage is supplied to the
boiler by correcting external wiring.
Check thermister and external wiring and replace as
necessary.
Does the wiring from the
boiler to the OpenTherm
device have continuity?
Set the DHW system to call for heat
Check system for water circulation
Set boiler correctly
Rectify wiring from
boiler to OpenTherm
device.
no
no
yes
no
no
no
yes
no
yes
yes
yes
yes
no
yes
5.15 NO DHW BUT CH OK
70
Installation & Servicing
SECTION 5 - FAULT FINDING
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING