Hi folks:

I heat my home with hot water baseboards - two zones, upstairs and
downstairs. Both zones are run on standard non-digital two-wire
thermostats.

Upstairs zone runs perfectly fine. No problem with the thermostat
either.

Downstairs zone has a problem. If left alone, the thermostat seems to
maintain the heat it it set at. If I try to increase the temp by
moving up the lever manually, you can hear the boiler get ready to run
(zone valve opens, circulator starts), but then it clicks off and
stops. Moving the lever back down will sometimes cause the same sound
- as if it is ready to go, and then dies again.

I have replaced the basement thermostat with another non-digital one.
Same problem.

Any thoughts on a cause?

Dave

On 2 Feb 2005 18:26:26 -0800, (Dave Gallant)
wrote:

Hi folks:

I heat my home with hot water baseboards - two zones, upstairs and
downstairs. Both zones are run on standard non-digital two-wire
thermostats.

Upstairs zone runs perfectly fine. No problem with the thermostat
either.

Downstairs zone has a problem. If left alone, the thermostat seems to
maintain the heat it it set at. If I try to increase the temp by
moving up the lever manually, you can hear the boiler get ready to run
(zone valve opens, circulator starts), but then it clicks off and
stops. Moving the lever back down will sometimes cause the same sound
- as if it is ready to go, and then dies again.

I have replaced the basement thermostat with another non-digital one.
Same problem.

Any thoughts on a cause?

Dave

I would change the thermostat again. And, if that doesnt work, Id
change the stat again, and again.
Bubba

Dave, there is an end line switch built into the zone valve. When the valve
is completely opened ( electrically ) the end line switch closes and
energizes the relay for the circulator. From what you're saying it sounds
like you've got a problem with this switch. Not knowing who's zone valves
you've got I can't tell you how to test it

"Dave Gallant" wrote in message
om...
Hi folks:

I heat my home with hot water baseboards - two zones, upstairs and
downstairs. Both zones are run on standard non-digital two-wire
thermostats.

Upstairs zone runs perfectly fine. No problem with the thermostat
either.

Downstairs zone has a problem. If left alone, the thermostat seems to
maintain the heat it it set at. If I try to increase the temp by
moving up the lever manually, you can hear the boiler get ready to run
(zone valve opens, circulator starts), but then it clicks off and
stops. Moving the lever back down will sometimes cause the same sound
- as if it is ready to go, and then dies again.

I have replaced the basement thermostat with another non-digital one.
Same problem.

Any thoughts on a cause?

Dave