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Replacing the Low water pressure switch
Before carrying out the following instructions it is advisable to protect the area and the boiler's PCB housing
A
against accidental water spillage.
•
Isolate the power supply and close the Gas isolation valve to the boiler.
•
Drain the boiler.
•
Remove the electrical connection.
•
Remove the water pressure switch.
•
Clean or replace the LWP switch then apply silicone grease to the 'O' ring before replacing.
3.4 Troubleshooting
Diagnostics
Blank LCD
Make sure that the PCB is powered: using a digital multimeter, check supply volt-
age is within tolerance ( Range 195 – 253 Vac )
In the case of no voltage, check the wiring & check the external 3amp fuse.
To access the internal PCB fuse please see fig. 13 and fig. 42 when replacing
please ensure it is rated at (3.15AL@230VAC).
LCD Fault codes
The display flashes and the relevant fault identification code appears.
There are faults that cause permanent shutdowns or Lock Outs (marked with the letter "A" for Alarm): to restore oper-
ation press the reset button once (detail 6 - fig. 1) for less than 1 second or use the RESET on the remote timer control
(optional) if installed; if the boiler does not restart, it will be necessary to eliminate the fault (see fault code table).
Other faults cause temporary shutdowns (marked with the letter "F" for Fault) which are automatically reset as soon as
the value returns within the boiler's normal working tolerance.
38
BLUEHELIX TECH RRT
fig. 41
cod. 3541P151 - Rev. 00 - 11/2018
18S / 24S / 30S
fig. 42- Fuse housing
EN
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