My Burnham natural gas hot water furnace has been going strong for many years and still heats very well.
Recently it developed a problem with the relay on the control (Honeywell R8285D) clicking rapidly when the unit is shutting off after heat cycle.
The control board was replaced but no change.
Description of sequence:
I switch on the heat with one of the 2 thermostats.
The furnace would come on and work as intended.
The damper opens, the circulation pump turns on, the burner ignites. Then when the cycle ends the burner turns off, then the circulation pump turns off and then suddenly the relay would start to rapidly switch with a loud clicking noise for a few seconds.
I recorded the noise here:
NOT ALLOWED TO POST EXTERNAL LINK
Additional observation is that it does not always do it. The furnace would run for hours without it during the day. It seems worse on cold mornings and colder days like today and is worse when the heat comes on in the morning.
This has been going on since the heating season recently started here in the Northeast.
It is a 2 zone system with electronic Honeywell programmable thermostats.
Any ideas what is causing it and what a possible fix it? Any help is much appreciated.
Recently it developed a problem with the relay on the control (Honeywell R8285D) clicking rapidly when the unit is shutting off after heat cycle.
The control board was replaced but no change.
Description of sequence:
I switch on the heat with one of the 2 thermostats.
The furnace would come on and work as intended.
The damper opens, the circulation pump turns on, the burner ignites. Then when the cycle ends the burner turns off, then the circulation pump turns off and then suddenly the relay would start to rapidly switch with a loud clicking noise for a few seconds.
I recorded the noise here:
NOT ALLOWED TO POST EXTERNAL LINK
Additional observation is that it does not always do it. The furnace would run for hours without it during the day. It seems worse on cold mornings and colder days like today and is worse when the heat comes on in the morning.
This has been going on since the heating season recently started here in the Northeast.
It is a 2 zone system with electronic Honeywell programmable thermostats.
Any ideas what is causing it and what a possible fix it? Any help is much appreciated.
source https://hvac-talk.com/vbb/showthread.php?2223332-1996-Burnham-Rapidly-Clicking-Relay-problem&goto=newpost
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