7
6 720 606 692 (02.05)
4.5
Fault Finding
The following table outlines some common problems and their solutions.
Frost Protection
In areas where the atmospheric temperature drops below
0°C, the heater must be drained to prevent damage due to
the expansion of freezing water.
Re-commissioning after repairs to the gas supply
Purge gas piping of air. Trapped air can result in the pilot
burner failing to light within 30-40 seconds. In that case,
turn off the hot water tap and then turn it on again. This
restarts the ignition cycle.
Problem
Cause
Solution
Appliance does not light.
Switch in "off" position.
Put it in the "on" position.
Pilot solenoid.
Replace solenoid.
Over temperature switch.
Replace switch.
No power to pilot solenoid.
Replace ICU.
Pilot lights but no main burner.
Slide control set to off.
Turn control to on.
Main solenoid open circuit.
Replace solenoid.
Smell of gas.
Luminous flame.
Clean burner.
Loose gas connection.
Locate leak with soap solution.
Yellow flame.
Burner venturi blocked.
Clean with venturi brush.
Water leak on top of water valve lid.
Damaged O ring.
Replace O ring, grease with Unisilkon
L641# 8709918413.
Excessive pressure.
Check water isolating valve.
(Must be gate
valve or similar).
Frost damage.
Drain appliance or fit Exogel expansion
valve # H707060151.
No variation in water flow rate.
Damaged selector shaft.
Replace shaft.
Excessive water pressure.
Check water supply pressure.
Low burner flame, water does not heat
up.
Low inlet gas pressure.
Check supply regulator and pipe size.
L.P.G. appliances - Check if gas container
freezes while in use. If so, place it in a
warmer location.
Low burner pressure.
Check appliance regulator.
Low water flow.
Check water flow rate.
Low flame.
Move slide control to high.
Low water temperature.
Water
flow
selector
set
in
warm
position.
Set flow rate to individual need.
Low gas pressure.
Check pressure.
Cross connection.
Disconnect
hot
outlet
with
cold
off.
Correct connection.
Low water flow.
Low water pressure.
Check and adjust.
Blocked water valve.
Clean filter.
Blocked heat exchanger.
Descale.
Blocked shower rose or tap aerator.
Clean.
Slow Ignition spark.
Faulty over temperature switch.
Replace switch.
No spark.
Faulty ICU.
Replace ICU.
Faulty flame sensing rod.
Replace flame sensing rod.
Pilot burner hard to ignite.
Insufficient water pressure.
Check and adjust.
Red led flashing.
Main burners go out during hot water
use.
Temperature limiter activated.
Re-ignite the appliance 10 minutes later. If
it happens again, contact your service
person.
