Replacement of parts
Tronic 3000T – 6 720 801 072 (2022/07)
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6
Replacement of parts
6.1
Changing the anode rod
▶ Turn off the power supply and drain the heater (see
Draining the Heater).
▶ Remove heating element (see previous section).
▶ Unscrew anode rod from threaded connection.
▶ Remove and replace the anode rod (
Fig. 12 [N]).
▶ Reinstall heating element.
▶ Refill tank with water before restoring power.
6.2
Changing the heating element
▶ Turn off power supply and drain the heater (see Draining
the Heater).
▶ Remove the heating element (see section on Removing the
Heating Element)
▶ Install new element with gasket, making sure the gasket and
element are positioned correctly. Tighten the retaining nuts
and make the wire connections.
▶ Ensure that the thermostat temperature sensor is inserted
into the well located on the element assembly and secured
with black rubber grommet.
▶ Refill tank with water before restoring power.
6.3
Changing the thermostat
▶ Turn off power supply.
▶ Disconnect the 2 wire connectors on thermostat.
▶ Loosen the two brass screws at right side of thermostat and
pull wires out.
▶ Remove thermostat temperature sensor from well located
in element assembly.
▶ Unscrew and remove the two Phillips screws holding the
thermostat onto the tank.
▶ Install new thermostat and re-attach wiring and screws.
▶ Ensure that the thermostat temperature sensor is inserted
into the well located on the element assembly and secured
with black rubber grommet.
7
Troubleshooting
Problem
Solution
Water does not get hot.
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. Also, it's important to understand that this is a
storage tank water heater and so it will take time for the water to get up to the set
temperature. If the appliance has only recently been filled with water and the power turned
on, please allow approximately 20 minutes to come up to temperature.
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.
Light not on.
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 water.
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).
Odor in water.
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.
Leaking
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).
Summary of Contents for ES 2.5
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