Dismounting The Water-Water Heat Exchanger; Troubleshooting - Baxi PRIME 1.24 Manual De Uso Destinado Al Usuario Y Al Instalador

10.4.2 Replacing the 3-way valve
To replace the switch valve, proceed as follows:
• Turn off the main DHW inlet tap.
• Drain the boiler (refer to the procedure in the section "Removing scale").
• Disconnect the 3-way valve wire from the boiler board.
• Disassemble the motor of the 3-way valve, removing the relative fixing
clip (D1).
• To remove the 3-way valve, first remove the clip of the filter (C1) and
remove the filter (C2).
• Remove the clip (D3) of the 3-way valve (D2).
• Replace the 3-way valve.
• Reassemble the burner following the above procedure in reverse order.

10.4.3 Dismounting the water-water heat exchanger

The stainless steel plate-type water-water heat exchanger is disassembled
with a screwdriver as described below:
• Disconnect the boiler from the power supply;
• Close the gas tap;
• drain the system, just the boiler if possible, through the drain tap (F);
• drain the water contained in the DHW system by opening a hot water tap;
• Remove the silencer and then loosen the two Ø6 mm Allen screws (G) securing the heat exchanger and pull it out;
• Clean the water-water heat exchanger using a natural product (i.e. vinegar);
• Reassemble the burner following the above procedure in reverse order.
10.4.4 Replacing the expansion vessel
Before replacing the expansion vessel, proceed as follows:
• Close the gas tap on the boiler.
• Turn off the main DHW inlet tap.
• Close the flow and return pipes of the CH system.
• Open the drain tap of the boiler.
The expansion vessel is located in the boiler on the right side.
11.

TROUBLESHOOTING

Display notifications can be of two types: volatile or permanent. First shown on the display, is a code consisting of a letter and
2 digits. The letter indicates the type of fault: temporary (H) or permanent (E). The digits indicate the group the fault belongs to,
based on safety level. In alternation to the first, a second code will also flash, consisting of 2 digits, indicating the type of fault (see
the fault tables that follow).
TEMPORARY FAULT (H.x.x.)
The temporary fault is identified on the display with the letter "H" followed by a number (group). The temporary fault is a type of
fault that stops the boiler temporarily, and disappears as soon as the cause has been resolved.
PERMANENT FAULT (E.x.x)
The permanent fault is identified on the display with the letter "E" followed by a number (group). Press the RESET button for 1
second. If faults are displayed frequently, call the Authorised Service Centre.
RESET
7696306 (01-12/17)
BO-0000076
BO-0000075
44
(1)
(2)
C
(3)
D
(1)
(2)
B0000052