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Troubleshooting; Resetting High Limit Switch - Bosch Tronic 3000T ES 2.5 Installation Manual And Operating Instructions

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Troubleshooting

7
Troubleshooting
Problem
Water does not get hot.
Light not on.
Brown water.
Odor in water.
Leaking
Table 3
14
Solution
Make sure the power supply is on and working.
If light does not come on, check that the high limit reset button is pushed in; follow steps
in section 7.1.
If the indicator light works properly but temperature does not get hot at the tap, test for a
plumbing crossover; shut off cold supply to heater and open hot water tap. There should
be no water flowing. Any continued flow indicates a crossover which will effect the
temperature and will need to be corrected.
Call a qualified service technician to test the resistance of the heating element (8-10
ohms). Heating element should be replaced if readings are outside these values.
If the light does not come on, but water gets hot, check for faulty bulb.
Check high limit reset button; follow steps in section 7.1;
Brown or rusty water indicates a "spent" anode rod and possible deterioration of the tank
body. Inspect the tank for leaks.
Check anode rod (see section on changing the anode rod).
Smelly water could be due to an unusual reaction between local water and the heater's
anode rod. Check anode rod (see section 6.1 Changing the anode rod).
Failure to do so may result in damage to the tank and leaks.
Check water fittings and T & P fitting on top of tank.
Remove front cover and inspect heating element gasket.
If tank is leaking call Bosch Water Heating for warranty claim if still within warranty
period.
Check anode rod (see section 6.1 Changing the anode rod).
Tronic 3000T – 6 720 801 072 (2018/04)

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