Bosch TRONIC 5000C Pro WH17 Technical Service Bulletin page 5

5 | Triac Printed Circuit Board Replacement
3. Reconnect the thin white signal wires; the three wire connector
goes to the printed circuit board mounted nearest the back. The
two wire cable goes to the printed circuit board on the left hand
side of the head on the 27kW & 36kW units.
Ensure the connector is aligned with all of the the pins
and not offset or the heater will not work properly.
Refi tting the cover
1. Before refi tting the cover perform a once over check:
Are all connections made correct to the wiring diagram for

this model?
 Are all connections tight?
Is there evidence of the heat transfer paste being squeezed

out from under each of the triac switches where they have
been clamped?
2. Refi t the cover using the 4 screws ensuring that no wires are
trapped and that the red clip in lens is not knocked out.
3. Fill the unit with water and follow the commissioning routine in
the user handbook. Ensure you have a continuous fl ow of water
from all the hot water faucets before resetting the breakers.
WARNING
DO NOT TURN ON THE ELECTRICITY UNTIL THE
UNIT IS FULL OF WATER AS THIS WILL DAMAGE
THE UNIT.
Data subject to change without notice | Printed in the USA | BTC 722002307 A | 01.2014
Bosch Thermotechnology Corp.
50 Wentworth Avenue
Londonderry, NH 03053
Tel: 1-800-283-3787
Fax: 1-603-965-7581
www.bosch-climate.us
Bosch Thermotechnology Corp.