Problems; Problem/Cause/Solution - Bosch T4200 14-2D Installation And User Instructions Manual

Problems

8 Problems
8.1

Problem/cause/solution

Assembly, maintenance and repairs must be performed by
qualified technician only. The following chart offers solutions to
Problem
The heater does not ignite and
digital display is turned off.
Slow and difficult ignition of the
burner. 
Red LED in switch flashes.
Water at low temperature.
Water is not heated, no flame.
The burner turns off the heater is
operating.
Incorrect temperature information
in the appliance digital display.
Digital display shows "E1".
Digital display shows "A7".
Blocked heater.
There is spark but the main burner
does not ignite, heater blocked.
Table 8
18
Cause
Batteries flat, not inserted correctly or
switch turned off. 

Flat batteries. 

Flat batteries.
Insufficient gas supply.
Temperature limiter has tripped
(digital display shows "E9").

Monitoring device of combustion
gases evacuation has tripped (digital
display shows "A4").
Insufficient contact of the temperature
sensor.
Water temperature sensor has tripped
(outlet water temperature above
85 °C).
Temperature sensor incorrectly
connected.
Temperature sensor defective.
Digital display shows "F7" or "E0".
No ionisation probe signal (digital
display shows "EA").
possible problems (solutions followed by an * must be
undertaken by qualified technician only).
Solution
▶ Check battery position and/or replace them,
check switch position.
▶ Replace them.
▶ Check and correct.
▶ Check the temperature selector position and
adjust it according to the desired water
temperature.
▶ 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.
▶ 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.
▶ Check and correct the temperature sensor
assembling.
▶ Reduce the water temperature using the
power and/or temperature adjustment
selector.
If the problem persists, call a qualified
technician.
▶ Check and correct connection.
▶ Replace the temperature sensor.
▶ Turn the heater off and on.
If the problem persists, call a qualified
technician.
Check:
• Gas supply.
• Ignition system (ionisation electrode and
electrovalves)
Therm 4200 – 6 720 821 605 (2017/08)