18
Problems
Therm 4300 – 6 720 821 607 (2018/01)
8Problems
8.1 Problem/cause/solution
Assembly, maintenance and repairs must be performed by qualified technician only. The following chart offers solutions to possible
problems (solutions followed by an * must be undertaken by qualified technician only).
Problem Cause Solution
The heater does not ignite and
digital display is turned off.
Slow and difficult ignition of the
burner.
Red LED in switch flashes.
Switch turned off.
Reduced water flow.
Reduced water flow.
▶Check switch position.
▶ Check and correct.
▶ Check and correct.
Water at low temperature. ▶ Check the temperature selector position and
adjust it according to the desired water
temperature.
Water is not heated, no flame. Insufficient gas supply. ▶ Check reducer, and if inadequate or
malfunctioning, replace it.
▶ Check if the bottles (butane) freeze during
operation, and if so, move them to a warmer
place.
The burner turns off the heater is
operating.
Temperature limiter has tripped
(digital display shows “E9”).
Monitoring device of combustion
gases evacuation has tripped (digital
display shows “A4”).
▶ Wait 10 minutes and restart the heater.
If the problem persists, call a qualified
technician.
▶ Vent the area. Wait 10 minutes and restart the
heater.
If the problem persists, call a qualified
technician.
Incorrect temperature information
in the appliance digital display.
Insufficient contact of the temperature
sensor.
▶ Check and correct the temperature sensor
assembling.
Digital display shows “E1”. Water temperature sensor has tripped
(outlet water temperature above
85
°C).
▶ Reduce the water temperature using the
power and/or temperature adjustment
selector.
If the problem persists, call a qualified
technician.
Digital display shows “A7”. Temperature sensor incorrectly
connected.
Temperature sensor defective.
▶ Check and correct connection.
▶ Replace the temperature sensor.
Blocked heater. Digital display shows “F7” or “E0”. ▶ Turn the heater off and on.
If the problem persists, call a qualified
technician.
There is spark but the main burner
does not ignite, heater blocked.
No ionisation probe signal (digital
display shows “EA”).
Check:
•Gas supply.
• Ignition system (ionisation electrode and
electrovalves)
Blocked heater, digital display
shows “F0”.
Supply was activated with a hot water
tap running.
▶ Turn the heater off and on.
If the problem persists, call a qualified
technician.
Table 8
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