Radiant RKR 25, User Manual

USER INSTRUCTIONS

4

■

D.H.W temperature control 

The domestic hot water temperature is regulated by 
knob 

3 

(see “Control panel”). 



  Rotating the knob anticlockwise reduces the 

temperature. 



  Rotating the knob clockwise increases the 

temperature. 



The range of temperature settings for the domestic 

hot water runs from a minimum of 35°C to a 
maximum of 60°C.

■

Topping-up the system with water 

The water pressure in the central heating circuit must 
be checked during the entire period of operation of the 
boiler. In this respect, the reading on the pressure 
gauge 

M

 (fig. 1), located on the lower part of the boiler, 

must not be less than 1 bar. 

If there is insufficient water in the boiler, the code 

H2O

 will flash on the display  (see fig 1).  

To bring the system back up to pressure, open the external filling tap 

R 

(fig. 1) and use the pressure gauge 

M

 (fig. 

1) to check that the system pressure reaches 1 bar and that the code H2O lights up. 

When the operation is complete, close the fill tap.  

Diagnostics – Error codes: 

This paragraph contains a list of error codes that the boiler may generate on the display 

8 

(see “Control panel”) 

together with the relative indications and the operations that the user can carry out to reset the boiler. 

If the problem re-occurs after the following actions have been taken, call an authorised Service 
Centre. 

_

E01

_ 

Ionisation block

Code 

E01 

lit continuously on the display.   



  Check that the gas valve on the boiler and gas meter are open and that there is gas in the mains supply (or in 

the tank).  



  Switch off then switch on the appliance using switch 

1

 (see “Control panel”) on the control panel. 



  When  the error code on the display disappears, the boiler will restart. 

If the problem persists, 

Call the Service Centre.

_

E02

_  

Safety Thermostat tripped

Code 

E02 

lit continuously on the display.  

Call the Service Centre.

_

E03

_  

Flue Gas Thermostat tripped

Code 

E03 

lit continuously on the display.  

Call the Service Centre.

_

h2o

_

  Water Pressure Switch tripped

Code 

H2O 

lit continuously on the display.   



  Check the water pressure in the central heating circuit. The reading on the pressure gauge 

M

 (see fig. 1), 

located on the lower part of the boiler, must not be less than 1 bar . 



  If the pressure is less than 1 bar, top-up the system as described in paragraph “Filling the system”. 



  The boiler will restart automatically. 

Fig.  1

M

R