The unit is set up for hydronic heating of a basement slab. Circulator is TACO007
The heater was installed in fall 2007 and run in winter 2008. Performed well.
Shortly after start up in 2009 I found the unit would not restart after the temp dropped below the thermostat set point. It would restart if I unplugged it (elec) and plugged it back in.
After this happened a few times I called the HVAC guy and he insisted it needed to be descaled. In the meantime the heater failed to a point that it would not restart even after unplugging it (elec). The flame comes on for one or two seconds then shuts down. The water goes cold and unit powers down completely.
I recirculated a sulfamic acid solution through the unit for an hr. A small amount of scale was removed. Not enough to use up the acidity of the solution.
Heater does same thing. Fires up, runs for a second or two then shuts down
Any ideas?
I have the HVAC guy scheduled (same as installer). but its been 4 weeks since original call and he is set on it being a scale problem.
The heater was installed in fall 2007 and run in winter 2008. Performed well.
Shortly after start up in 2009 I found the unit would not restart after the temp dropped below the thermostat set point. It would restart if I unplugged it (elec) and plugged it back in.
After this happened a few times I called the HVAC guy and he insisted it needed to be descaled. In the meantime the heater failed to a point that it would not restart even after unplugging it (elec). The flame comes on for one or two seconds then shuts down. The water goes cold and unit powers down completely.
I recirculated a sulfamic acid solution through the unit for an hr. A small amount of scale was removed. Not enough to use up the acidity of the solution.
Heater does same thing. Fires up, runs for a second or two then shuts down
Any ideas?
I have the HVAC guy scheduled (same as installer). but its been 4 weeks since original call and he is set on it being a scale problem.