TURBOmax VUW 282 E - Heatingspares247.com

7.20 Removal of printed circuitboards (PCBs)Before commencing work on PCBreplacements carry out the following:-• Diagnose which board requireschanging using the fault findingguide (see section 8: Fault finding).• Turn off the boiler as in section7.1.1.• Remove front casing as in section7.1.3.• Lower from control panel as insection 7.1.6.• Remove back of control box byundoing the 3 screws (1 and 2,fig. 65).7.20.1 Replacement of mainswitchboard• Disconnect external wiring fromboiler terminal strip.• Unplug 2 ribbon cables fromcontrol board (2, fig. 75).• Unplug all leads from the mainswitchboard.(1, fig. 75) and liftswitchboard carefully out of controlbox.• Reassemble in reverse order.Note: When refitting the mainswitchboard ensure that the on/offcontrol knob spindle (3, fig. 75)engages correctly into the on/offswitch (5, fig. 75) mounted on theboard.• Carry out electrical checks (seesection 5.1)fig. 75GW 615/07.20.2 Replacement of control board• Unplug 2 ribbon cables fromcontrol board (2, fig. 76).• Push four spring retaining clips(5, fig. 76) out, and gently liftcontrol board out of control box.• Reassemble in reverse order.Note: When refitting the controlboard, ensure that the user controlspindles (a, fig. 75) are aligned withthe potentiometer and control switchholes (b, fig. 75) and that the locatingrib of the potentiometer/switchcorrectly engages in the groove of thecontrol knob spindle.• Carry out electrical checks(see section 5.1)fig. 76GW 617/043