DORCHESTER DR-LA 110, User Manual

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is
Instruction manual DR-LA 53
Warning
Maintenance may only be performed by a qualified service and maintenance engineer.
8.3 Troubleshooting table "no hot water"
If the water heater fails to supply any hot water, there are several possible causes.
Refer to table
Table 8.2 No hot water .
Explosive ignition
Poor flame profile
Incorrect supply
pressure and/or burner
pressure. Set the correct supply pressure and/or burner pressure, see
3.11 Checking the supply pressure and burner pressure .
If ignition is not improved, consult your installer.
Contaminated burner Clean the burner. See 9.4.2 Cleaning the burners
Contaminated orifice. Clean the orifice. See 9.4.3 Cleaning the orifices
Inadequate air supply Improve the air supply by better ventilating the boiler room.
Table 8.1 General errors Page 2 of 2
Symptom Cause Solution Remark
Table 8.2 No hot water
Page 1 of 2
Symptom Cause Solution Remark
Green LED OFF
and
Red LED OFF
No voltage from power
supply 1. Check that the isolator is ON.
2. Check the voltage across the isolator.
3. Check the voltage on the electrical connector block.
4. Check the voltage on the burner control.
5. Check the fuse in the burner control.
The measured voltage must be 230V AC +15% -10%. See appendix 1.2 Electrical diagram DR-LA . If you cannot resolve
the error, contact your installation engineer.
Green LED ON
and
Red LED OFF.
Blockage in the flue
gas discharge (the
combustion products
discharge safety
device has cut out) 1. Trace the blockage.
2. Remove the blockage.
3. Reset combustion products discharge safety device. See
paragraph 5.7 Flue gas thermostat reset button .
When heat demand is detected, the water heater will re-start.