System Schematics
General Troubleshooting
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
p. 45
p. 44
General Failure Symptoms of the Burner
This section will cover the typical failures of the diesel burner.
Refer to the table more fails and their remedies.
Burner Troubleshooting
Service of the Burner
The service or maintenance should be done once a year to
maintain the functional reliability of the burner. The service and
any repairs must only be performed by trained technicians.
Proper preventive maintenance greatly improves the burner
performance.
• Visual inspection of the burner for any external damage,
fastening, and also external cleaning (make sure power
is disconnected before any cleaning).
• Inspect electrical connections for corrosion, making
sure they are all properly secured and free of any kinks,
cracks, or damage.
• Check the exhaust and combustion air lines for signs of
damage and make sure they are clear of debris or any
blockages.
• Check fuel lines for any leaks, kinks, cracks, or damage.
• Check plumbing lines and circulation pump to make
sure they are properly secured and free of any damage.
• Check the fuel pump and circulation pump for any
damage.
• Run the burner for 20 minutes once a month.
• Clean the burner of any debris or dust with compressed
air.
•
Change the fuel filter once a year.
Figure 89
Failure Symptom
Possible Cause
Remedy
Burner switches off auto-
matically (fault lockout)
No combustion after start or automatic
repeat start
Flame extinguishes during operation
Burner overheats
Switch off burner and switch back on.
• Check coolant lines for obstructions, closed valves, and kinks.
• Check coolant level, purge any air. Allow burner to cool down.
Check for failure codes.
• Charge/replace batteries.
• Switch off burner and switch back on.
Heater is letting out black
smoke from the exhaust
Combustion air and/or exhaust tube is
blocked
Check combustion air intake and or/ exhaust tube.
Burner does not switch on
Heater is without electrical power
Check power supply to the unit and ground connections.
Burner switches off during
operation (= fault lock-out)
Burner has overheated due to lack of
coolant
Refill antifreeze and water mixture.
PIN OUT INFORMATION
NOTE:
All connectors are
shown from Pin insertion
side.
