I have a Cozy one-sided gas wall heater. It is no longer lighting the burners when the wall thermostat reaches the temperature set point. The thermostat will "click" on, but the burners won't ignite in the heater. This has been an intermittent problem, but is growing steadily more frequent by the day. Sometimes when the burners won't ignite, I'll bang on the heater and then they ignite. But even that "temporary fix" is becoming less effective. What part on the wall heater needs to be replaced or serviced so that the burners light when the wall thermostat sends out its signal? A new wall thermostat was installed about a month ago because the same problem was happening with it, so I know it's not the thermostat.
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