STIEBEL ELTRON CE Series Operation And Installation page 28

INSTALLATION
SPARE PARTS AND SERVICE ADVICE
Turn on the power supply.
Turn on the on/off power switch.
Transformer
Disconnect the heater from the power supply.
Check for continuity on the fuse FLM1-1/4 to be sure the problem is not just a transformer fuse.
Replace wire from the transformer distribution block. Make sure to mark the wire to the desired port.
Loosen the mounting screws in the corner of the transformer to the support bar.
Replace the transformer and rewire the spare part transformer as before.
Pressure switch
It is possible for the pressure switch to be become so blocked with residue or dirt that it does not function and allow the heater to turn on.
Disconnect the heater from the power supply.
Check for continuity across the poles of the switch with water pressure on the heater. The water pressure needs to be more than 3 psi
(0.21 bar). If there is continuity, the pressure switch is not the cause.
If there is no continuity, drain the water from the heater and remove the wires from the switch. Mark the wires with the switch pole
designation. Pole nb. 1 needs to be connected to the transformer.
Remove the switch using an open-end wrench.
Check for water leaks.
Rewire the switch.
Triac failure
If there is lukewarm water in steady state status of the heater, check the ampacity of each supply wire from the element contact to the triac
supply. If there is no ampacity from the triac supply to the element, replace the triac.
For triac replacement, make sure that enough heat transfer paste is applied between the cooling plate and the triac.
Indicator light
Disconnect the heater from the power supply.
Clip the wires to the light. Pop out the light socket out of the hole in the enclosure.
Install the spare part light. Rewire the spare part light.
Element fuses
Disconnect the heater from the power supply.
Remove the failed fuses from the fuse holder.
Replace the fuse. For elements larger than 6000 W at 240 V rating, use MDL 35 type fuse. For smaller elements use part number KLK
30.
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