is
Instruction manual DR-LA
54
Warning
Maintenance may only be performed by a qualified service and maintenance engineer.
Green LED ON
and
Red LED ON.
There are three possible causes for this error. To determine the cause, the error must be
made to recur:
1. Reset the water heater by pressing the reset button once;
2. Should nothing happen, then the reset button has already been pressed too often
(maximum 5 times in a single heating cycle) and you will have to first electrically isolate
the water heater, then start it again. See paragraph
7.3.2 Isolate the water heater from
and steps
through
.
3. Decide which type of cause (a) or (b) describes the situation.
(a) three unsuccessful
start attempts in a row
1. No gas:
•
Check that the gas valve is open.
•
Check that gas control opens (clicking of the gas control).
•
Check the gas control wiring.
2. No ignition:
•
Check whether the hot surface igniter lights up.
•
Check the power supply to the hot surface igniter.
•
Check the wiring of the hot surface igniter.
3. No flame detection:
•
Check that the Phase (L) and Neutral (N) are correctly
connected (from the power supply) to the water heater
•
Check that the flame probe is not defective.
•
Check that the wiring to the flame probe is correctly
connected.
If the error cannot be resolved or is persistent, contact your
installer.
(b) The safety
thermostat has cut out
1. The safety thermostat has cut out correctly:
•
Reset the water heater.
•
Check whether the control thermostat is working.
•
Check whether the high-limit thermostat is working.
•
Check that the circulation pump (if present) is working.
2. The safety thermostat has cut out without apparent reason:
•
Check whether the thermostat may be broken.
•
Check whether the thermostat sensor may be broken.
If the error cannot be resolved or is persistent, contact your
installer.
Table 8.2 No hot water
Page 2 of 2
Symptom
Cause
Solution
Remark
