Got a Montigo fireplace (ME34DT-2) with a sit nova 820 valve.
Lites up ok, but after about 5mins, it starts to cycle on and off. The pilot stays lit.
Replaced both the thermal pile and couple (figured while I was there would replace both.)
Seamed Ok, then started to do it again. Checked the voltage of the thermal pile ~ 520 - 530mv on pilot only, but when I turn on the fire place, the voltage drops to about 220mv then slowly drops and stabalizes about 190mv.
Any Ideas would be appreciated