Arrived at call for water heater, not lighting. Upon further investigation into plumbing issue, we found that pilot light will light, but gas valve will not indicate correct temperature. Limit switch was tripped. We called tech-support, they recommend cleaning bottom compartment of water heater. Customer signed off on option to replace burner assembly. While replacing assembly, we will clean bottom compartment. Part is currently not ready and available. We will contact customer as soon as we have estimated time of delivery of material, we will then put them on schedule and perform work. Customer has joined our membership.