Hot Water Troubleshooting - WaterLogic WL4FW FIREWALL Fault Finding

Hot Water is not Hot (85° +/- 5°C)
The Hot temperature set point is 85°C and is controlled by a thermostat on the side of the tank.
There are two resettable overheat or high limit safety above the thermostat on the side of the tank
that will trip to prevent damage to the unit if the tank is dry heated (turned on without water in it).
It typically takes 10 minutes for the 500W to heat the 1.2 Litre of room temperature (ambient) water
to the 85°C set point.
Possible Reason
Is unit in sleep mode?
No power to heater elements
Loose or improperly
connected wire(s) to the
heating element / hot tank.
Overheat Tripped
Overheat are a safety feature
to ensure the tank does not
overheat.
Thermostat or overheat
"open" on Hot Tank
Heating Coil not Working
WL4FW Fault Finding
HOT WATER TROUBLESHOOTING INDEX
If no water has been dispensed for 3 or more hours, unit goes into
sleep mode. Dispense hot water, wait 5 minutes, check
temperature.
If unit still does not heat proceed to "No power to heater
elements" below.
Check that the Green Heater /
Compressor switch is on. I = ON
Visually inspect wire leads gong to the hot tank; confirm proper
connections to the heating elements.
Hot tank life is 3-5 years, depending on usage.
Overheat will "click" when pushed. The overload is automatically
reset when pressed.
Turn Power off. Check OHM's resistance across terminals on each
Thermostat and Overheat separately.
Good components will indicate a closed circuit or zero OHM's on
the meter.
Replace components as necessary.
Turn Power off; Drain hot tank; Use multi-meter to check heater
element for approximately 26 OHM's resistance.
Hot tank must be empty if you are checking for continuity.
Replace Hot Tank as necessary.
Solution
Page 11 – Revision: EU27-11-2017