Issue
The D2L (Airtronic 2) heater would not fire up.
The below fault code came up which was a generic fault and all were ok.
Solution
After inspection, we found that the glow pin was only getting warm, not hot enough to ignite the fuel. (The glow pin read the correct oms reading and no-fault was displayed for the pin but was clearly faulty)
2nd Fault which could affect the burner
After a new glow pin was fitted, the D2L didn't get up to full temperature and was making a strange noise, which was coming from the burner chamber (you can hear this via the exhaust pipe)
The burner was also faulty /damaged, which was caused by the faulty glow pin not getting up to full temperature and caused the burner to carbon up.
A new burner was also fitted to rectify the fault.