F.33
FAULT CODE
Vaillant
VR40 Relay Switch-Off After 24 Hours
Medium Severity
Engineer Required
The relay in the gas valve has not switched after 24 hours. This is a safety timeout to prevent the relay contacts from welding together.
Step-by-Step Fix Guide
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Step 1
Reset the boiler by pressing and holding the reset button for 3 seconds
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Step 2
If the fault recurs, the gas valve relay may be faulty
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Step 3 Engineer only
A Gas Safe engineer will need to inspect and potentially replace the gas valve
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.