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7.7.2 Number of cycles
To see how many cycles the appliance has done, please enter
the "Diagnostic menu" (chapter 7.7);
▶ Select the sub-mode "C0".
Write the number that shows in the display.
▶ Select the sub-mode "C1".
Write the number that shows in the display.
▶ Select the sub-mode "C2".
Write the number that shows in the display.
After checking the sub-modes C0, C1 and C2, introduce the
values in a table as the example;
Example:
Calculation of number of cycles (1 cycle = 1 ignition),
Number of cycles
Number in C0
40
Number in C1
6 (X 100) =
Number in C2
1 (X 10 000) =
(C0 + C1 + C2) = Total of cycles
Table 53
C 950/C 1050 (Pro TL 175 C/199 C) – 6 720 805 440 (2019/10)
8
▶ If you are unable to perform the tasks listed below, or need
8.1
Many of the questions customers ask regarding operation of
this unit can be answered by following the troubleshooting
steps as outlined below. Visit our web site at
www.boschheatingandcooling.com for more detailed
troubleshooting. For best results, perform each step before
proceeding to the next. The suggested solutions may require
40 +
that the cover be taken off. (See fig. 3, page 12).
600 +
8.2
10 000
It is recommended to use "Control board diagnostics" page 62,
10 640
chapter 7.7 as a tool for problem solving. If the display is
showing a blinking two digit code, refer to this section.
1. If the display is blank, verify power to outlet. (120VAC/
2. Verify the fuses in the control board are good. To access
3. Make sure cold water inlet connection is plumbed to the
4. A minimum of 0.5 gallons per minute (1.9 l/m) of hot water
5. Clean inlet filter screen per chapter 4.9, page 44.
6. Inspect the water path for obstructions. Make sure all
7. Check for plumbing crossover. A crossover in the hot and
Troubleshooting
CAUTION:
additional assistance please contact a qualified gas
technician.
Introduction
Burner does not ignite when hot water is
turned ON
60Hz properly grounded circuit required). Verify that the
heater power button is pressed ON.
fuses, the control board must be removed. See
chapter 5.2, page 51.
right side of heater when facing unit. See fig. 35, page 44.
demand is required to activate the heater. Confirm at least
0.5 gpm flow by timing how long it takes to fill a container.
A quart container should fill in 23 seconds or less, from hot
water tap only, to activate heater. In unusual circumstances
with high inlet water temperatures and low set
temperatures, the heater may increase the activation rate
above 0.5 gpm to avoid overheating at low flows. Gradually
increase water flow (hot water demand) through the heater
to determine if the heater activates with higher flow.
shower heads, faucet aerators and whole house filters are
clear of debris.
cold plumbing pipes creates back pressure on the water
flowing through the heater. Therefore, a higher flow rate
than normal is needed to force the heater to activate. To
check for a plumbing crossover, shut off the cold water
Troubleshooting
63
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