Initially system worked well.
After about 12 months time delay to fire up when CH demand or Hot Water demand became very erratic (from 10 Secs normal to 1-2 mins to not firing up at all).
Error indication Water Flow Switch or Limit Stat Intervention.
Cleaned CH Water Filter..partially block with black sediment, cleaned and refitted.
Checked Diverter valve operation OK.
Refilled and repressure system..... Similar problems persist.
Chcked Flow Switch Unit, slight signs of water leak. Replaced Flow Switch Unit. No Improvement.
Flushed System and refilled with Inhibitor....still same problems, some times OK for few days then erratic delays or not firing up.
Eventually when testing water flow micro switch found resistance to vary between 0 ohms to 2K ohms when operated (open cct when not operated).
Replaced microswitch....... bingo no more problems...
After about 12 months time delay to fire up when CH demand or Hot Water demand became very erratic (from 10 Secs normal to 1-2 mins to not firing up at all).
Error indication Water Flow Switch or Limit Stat Intervention.
Cleaned CH Water Filter..partially block with black sediment, cleaned and refitted.
Checked Diverter valve operation OK.
Refilled and repressure system..... Similar problems persist.
Chcked Flow Switch Unit, slight signs of water leak. Replaced Flow Switch Unit. No Improvement.
Flushed System and refilled with Inhibitor....still same problems, some times OK for few days then erratic delays or not firing up.
Eventually when testing water flow micro switch found resistance to vary between 0 ohms to 2K ohms when operated (open cct when not operated).
Replaced microswitch....... bingo no more problems...