No Ch But Dhw Ok - Keston HEAT 2 45 Installation & Servicing

5.14 NO CH BUT DHW OK

Is the heating circuit set for day or
in a timed (on) period operation?
Are the Timer and Room
Thermostat calling for Heat?
Are the Radiator Valves open?
Is an OpenTherm device connected
to the
Is there a room sesnor configured
and connected for the heating circuit?
Is there an outside sensor
configured and connected for the
heating circuit?
Is a switched live being used as a
no
heating circuit demand?
Is there a 230 av at SL1?
Does the boiler have a system or
heating circuit pump connected?
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)
72
SECTION 5 - FAULT FINDING
no
yes
no
yes
no
yes
yes
boiler?
no
yes
no
no
yes
no
yes
no
yes
Set for day or in a timed (on)
period operation?
Ensure that the Timer and
Room Thermostat are calling
for heat
Open the Radiator Valves
no
Does the wiring from
the boiler to the
OpenTherm device
yes
have continuity?
Check wiring continuity:
R(25ºC) = 10,000 Ω
This is not a boiler fault.
Ensure voltage is supplied to
the boiler by correcting ther
external wiring
Check system for water circulation
Rectify wiring from boiler to
OpenTherm device
Installation & Servicing