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INSTALLATION
SPARE PARTS AND SERVICE ADVICE
11. Spare parts and service advice
DANGER
: Electrocution
Before proceeding with any installation, adjustment,
alteration, or service of the appliance all circuit break-
er, switches servicing the appliance must be turned off.
Make sure that nobody can activate the breaker in the
distribution panel during your service work on the ap-
pliance.
DANGER
: Burns
Water temperatures over 125 °F (52 °C) can cause severe
burns instantly or death from scalding. A scalding poten-
tial risk exists on any connected tap or fixture and on the
surface of the heat exchanger during service.
Before opening the housing for service, ensure the on/off
switch is in the “off” position.
Flush cold water through the heater for several minutes.
The ball valves need to be completely open.
Pressure switch
Check the water supply pressure. The heater requires 3 psi (0.21 bar) to activate the pressure switch. Check for continuity across the switch
contact. If the switch is not closed and the pressure is more than 3 psi (0.21 bar), the mechanical portion of the pressure switch may clogged
with debris.
Thermostat/safety cut-off
The thermal safety cut-off also has a permanent cut-off safety function in case of an emergency caused by overheating. The fuse side of the
thermostat is designed to be destroyed by extreme heat. Should this occur, the individual thermostat/safety cut-off will need to be replaced.
If the thermal cut-off was not overheated, it will have continuity.
The thermal cut-off condition is determined by a continuity check
after power is off and cold water has been run through the heater
.
If the cut-off has no continuity, it should be replaced . Make sure that the water is drained, and the power supply is off. Remove the wires to
the cut off with a flathead screwdriver. Remove the Allen screw with a ¼˝ T-handle Allen wrench. Remove the thermal cut-off and replace
it with an identical spare part item, e.g. L125 T puts out 125 °F hot water. Do not mix them with any other temperature designated item.
Replace the cut off clips. Make sure that the concave end is down to create a tight seal. Reinsert the Allen screws. Reattach the wire. Make
sure that the wire screws are tightened fully.
Element
If the heater display shows active heating and there is still lukewarm water at the desired flow rate, a failed element may be the cause.
f
Disconnect the heater from the power supply.
f
Check each element with an Ohm meter for correct reading. See 4.3, “Cold element resistivity by heater type (in Ohms)”, pg. 5, to
identify the element resistivity according to the heater name plate and wattage. If the element reads 0 Ohm or the meter flickers, the
element needs to be replaced.
f
For replacing the identified bad element, use a Phillips screwdriver to remove the wire. If there is more than one failed element, mark
the wires of the associated elements.
f
Close the ball valves and drain the heater.
f
To remove the element from the heat exchanger socket, use a 1 1/2˝ socket wrench spanner. If the failed element looks like it is split
from the inside, this can be caused by air contamination during heating.
f
Insert the new element, being sure that the replacement element has a factory provided O-ring in place.
f
Tighten the element. Make sure that it is not overly tight. This will ruin the O-ring sealing.
f
After all elements are replaced, check for leaks by opening the ball valves and running water through the heater.
f
Reattach the wires to the element.
