Vaillant THERMOcompact VC240 User Manual

Vaillant Training/Logical Fault Finding Guide for all
COMBlcompact and THERMOcompact models
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HEATING,CONTROLS,HOTWATER.

Vaillant THERMOcompact VC240 Specifications

General

Mounting	Wall-mounted
Output	24 kW
Fuel Type	Natural Gas
Weight	36 kg
Warranty	2 years
Boiler Type	Combination

Summary

Room Sealed Fan Flued Models (RSF) Troubleshooting

Check Fan Operation

Determine if the appliance fan is running.

Troubleshoot Fan Not Running

Diagnose issues preventing the fan from operating, including lockout, fuses, and thermostats.

Check Ignition Attempt

Troubleshoot Ignition Failure

Check Burner Ignition and Stability

Troubleshoot Burner Not Lighting or Staying Alight

Troubleshoot DHW Operation Issues

Balanced Flue and Open Flue Models Troubleshooting

Check Pilot Light

Troubleshoot Pilot Light Failure

Check Red Neon Indicator

Verify if the red neon indicator on the main switch is illuminated.

Troubleshoot Red Neon Failure

Diagnose why the red neon indicator fails to light.

Check Pump Operation

Verify if the circulation pump is running.

Troubleshoot Pump Not Running

Diagnose issues preventing the pump from running.

Check Hydraulic Operation

Troubleshoot Hydraulic System Issues

Check Burner Lighting

Troubleshoot Burner Not Lighting

Check Burner Modulation to High Fire

Troubleshoot Burner Modulation to High Fire

Check Burner Modulation to Low Fire and Shut-off

Troubleshoot Burner Modulation to Low Fire

Check DHW Operation (VCW Models)