In most cases the reason for a NRG control to have intermittent scrambled or garbled screen relate to external, internal interference on the electrical circuit. It is important that the mains cables to the NRG pass through the ferrite core as supplied, to reduce the risk of electrical interference and that the interconnections control wiring terminated within the NRG does not form loops that may generate transient voltages that can give off EMF (electromagnetic fields) which may have adverse effects on the electronic components within the NRG.

Another common cause of intermittent faults on NRG controls can be linked to interruptions in power supply e.g following a power cut.

• When the NRG screen scrambles follow the sequence below.
• Turn off the power supply to the control for 2 mins (if wired correctly to warm air heating equipment, turning off the control would not result in the heater tripping out from overheating)
• Turn the power supply back on (the control should return to normal function) if the problem remains proceed to the next step.
• Turn the power supply off (if unsure consult an engineer) remove screw convers 2 from the top and 2 from the bottom.
• Remove screws
• Remove the front of the NRG keeping the ribbon cable attached.
• Remove the battery located on the left hand side of the PCB (approx size of a 10p)
• Leave the control to stand without power and battery for 15 min
• Re-fit battery
• Re-fit front of control
• Turn power supply back on ( the control should return to normal function) If the problem remains proceed to the next step
• Contact you usual heating engineer for assistance of [email protected] to arrange an engineer’s visit.