Mertik Maxitrol Remote systems are all ultrasound frequency and are all set the the same frequency.

Standard remotes (black) are a different frequency to the thermostatic remotes (silver with a digital lcd dispay)

i sell fireplaces and can confirm this as a fact.

the best place to get replacements is fef uk ltd, gazco fires, or glen dimplex UK ltd, FEF UK ltd being the cheapest of these options

To TEXASJETMAN, the logs are either laid incorrectly, there is insufficient ventilation in the room 100CM2 if the gas input is over 7kw or the fire is overdue a service... ensure the gas jets are not blocked and that you are using the correct log set for the appliance, mertik maxitrol is just a brand name for gas controls and is not the fire brand