Bosch TRONIC 3000C Pro US3 Installation Manual And Operating Instructions page 15

Symptom Cause
Water Fluctuating water pressure and/or
temperature flow is causing the flow switch to cycle
fluctuates. on and off.
Table 8
TRONIC 3000C Pro
What to do
Increase the flow rate.
Be sure that the isolation valves are properly adjusted.
Be sure that the inlet filter screen is clean.
Be sure that the outlet restrictors and aeratots on showers and/or
faucets are clear.
Be sure that there is no plumbing crossover by shutting off the inlet
isolation valve and opening an hot water outlets served by the Tronic
3000C Pro. If there is a steady flow, then cold water is flowing into
hot water service lines and back-pressuring the Tronic 3000C Pro.
This condition must be fixed or the heater wil not work properly.
Troubleshooting | 15
6 720 647 005 (2014/04)