Have a Hydrotherm model HC-165 hot water boiler with 4 zones. Occasionally the water temperature in the
boiler drops below the pre-set temperature of 160F even though the different zones are "calling" for hot water.
All thermostats are set to a higher temperature than than the temperature in the house. Water flows
from the boiler to the different parts of the house, but its cool water.
I check the temperature in the boiler, and its around 60F. Confirmed all transformers connected to
the boiler are outputing 24V, NG pilot light is on, zone valves that control water flow to the different
parts of the house are open.
If I reset the circuit breaker switch for the boiler, it fixes the problem. Boiler starts up and the
water inside it gets heated up. works fine for a few days or weeks and the problem re-occurs.
A while back I replaced the thermostat that plugs into the boiler but that didn't fix the problem.
Any idea what could be wrong?
2006-11-19
06:34:48
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3 answers
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asked by
aosterma
1
in
Maintenance & Repairs