Hi,
My Pentair Mastertemp 400 goes through its electronic startup routine and then reports a HLS error (and service heater led). My water is circulating normally, my chlorine generator is saying that it is working but the heater stops as quickly as it starts without lighting or blowing. I removed the Thermal regulator and that, when tested, operated perfectly. If I reduce the temperature setting of the heater to below the reported water temp (66), the Service Heater led goes off. Does that imply the circuit board is fine? I don't know what I am supposed to do to bypass the HLS sensor to determine if it is the problem. I will open the manifold if necessary but it is a biggish job and I don't want to do it unless it is necessary. Any clues as to what I can do to determine the most likely cause of the problem. It worked fine prior to closing down last fall and I haven't heard the heater fire up yet. Gas is on. Opened the case and didn't see any animal habitat, no chewed wires.Any help would be greatly appreciated.
My Pentair Mastertemp 400 goes through its electronic startup routine and then reports a HLS error (and service heater led). My water is circulating normally, my chlorine generator is saying that it is working but the heater stops as quickly as it starts without lighting or blowing. I removed the Thermal regulator and that, when tested, operated perfectly. If I reduce the temperature setting of the heater to below the reported water temp (66), the Service Heater led goes off. Does that imply the circuit board is fine? I don't know what I am supposed to do to bypass the HLS sensor to determine if it is the problem. I will open the manifold if necessary but it is a biggish job and I don't want to do it unless it is necessary. Any clues as to what I can do to determine the most likely cause of the problem. It worked fine prior to closing down last fall and I haven't heard the heater fire up yet. Gas is on. Opened the case and didn't see any animal habitat, no chewed wires.Any help would be greatly appreciated.
