Bosch C1210ESC Technical Service Bulletin

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Technical Service Bulletin:C6 & C7 Error Code TroubleshootingModels: C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES, 2400ES,2700ES, 715ES, C800ES, C920ES/ESC, Integra 500, Evolution 500IntroductionThis procedure must be performed by a qualified technician.DANGER!120 VAC present in wire connections. Use cautionwhen testing.Follow the procedures below and report results to Bosch TechnicalSupport. This will assist in determining the cause and solution to theproblem.C6 and C7 error codesThese errors are fan-related error codes with the followingexplanations: C6 error indicates the primary fan rotation is too low duringoperation. C7 error indicates there is no primary fan rotation sensedduring an attempted start-up.Primary Fan Assembly The primary fan is a 120 volt AC fan that receives power fromthe main control board. The primary fan has its own built-in circuit board which relaysinformation and signals back to the control board.Tools needed: Phillips head screwdriver Digital Multi-meterProcedure1. Press the reset button on the control panel of the heater toattempt to clear the error code. If the error code does not resetor continues to reoccur, proceed with the following trouble-shooting steps.2. Confirm that the exhaust vent is not blocked and doesnot exceed the specified maximum length as shown in theinstallation manual.3. Ensure that the 3 foot minimum separation between air intakeand exhaust vents is met (applies to a twin pipe vent system).4. Verify the heater is plugged into a properly grounded 120V ACpower supply.5. Supply the heater with a steady supply voltage. It isrecommended to supply electricity from a dedicated electricalcircuit with no other major appliances on the same circuit.6. Shut off power to the heater and unplug from electrical outlet.Remove cover per installation manual.7. Remove the black plastic intake (Fig.1, pos.1) that is securedwith three Phillips head screws to the fan (Fig.1, pos.2).Figure 18. Check the wire connection to the fan. The wire connection islocated on the back, left hand side of the fan housing. (Fig. 2).

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