I have a Bosch Aqua Star GWH 2400 ES NG with Error code C7. Ran through diagnostic, 5D = 00. What does this mean?
C7 code has to do with your main fan. Either its not working due to it being blocked or having gotten wet/damaged/power surged, or your control unit isn't supplying the correct 120V to the fan. Your control has a ceramic fuse that you can test as well.
First, look for 120V to either the left or right pair of wires in the molex plug on the fan. if you have voltage, then the fan is bad. If you dont, its either just a fuse, the board is bad, or the fan is bad causing the fuse to blow. Insert the supplied spare fuse, and power up the unit. If it blows the fuse again, its the fan.
SOURCE: error codes re: fan speed fan very noisy
I was looking for a service manual, which you apparently do not supply. I was not looking for someone who will charge me a fee to get information. I can get that info directly from Bosch for free. Thank you for answering. John
SOURCE: Bosch tankless watwer heater GWH
Hi,
The unit is plugged up with mineral buildup from the water going through it... it will need to be cleaned internally....this is done by running an acid solution through it to clean out the mineral buildup...
Then it will work again...
heatman101
SOURCE: i have a bosch gwh
Before calling service technician, open following link to download typical manual, get Bosch contact information etc.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Add a comment with your experience so others with same-similar problem can benefit.
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SOURCE: I have a Bosch Tankless
Yes. Contact Bosch.
Error codes are considered start-point for troubleshoot.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Tankless are complex electronic machines.
If on-site plumbers cannot figure out problem, then you need trained service technician with a service manual for your specific product, who can ohm-test the electronics.
Bosch will have a list of trained service technicians. And maybe Bosch has another step for fixing problem yourself.
Fix most tankless problems yourself, same day, for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
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