viessmann boilers

creger.robert

have viessmann model vb2-40 with riello burner lpg -is there a way to test primary control box 525
unit does not light on and off-if it lights it stays running.checked gas pressure ok. seems to be sparking

GW

Trying a new primary box is simple and fast. Propane can be tough, moisture is tank and sticky regulators can soak you for time and energy. We had one Riello gas kick us hard once, had to walk away. That job had an undersized gas line, homeowner didn’t want to deal with it.