Question about Honeywell Programmable Thermostat Heater
Thanks to Wellinka have sorted timer issues re heating off periods so thanks for that.
Have a problem seperating the hot water/heating with the CM921 and a Baxi duo tec 28 He. Can only get hot water when heating programmed on so nothing during night if needed. Any useful suggestions appreciated please.
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Posted on Jan 02, 2017
Since you have three on/off timing modes could there be an overlap in the times?
The wires in the unit might be crossed. (don't always assume the contractor who wired maintained the correct colors , I have a friend who blew out a heating pipe because when a replacement motor valve was installed it was never wired right and the plumber assumed the colors were correct so no overtemp shutoff created steam in PVC pipes, OPPS)
There fore maybe one is still coming on. Do you have more than one heating zone? IF so see below
I guess the main question is why manually turn it off? why not use the program.
I will assume your heat is know as forced hot water heating. My house is multizoned however when the zone calling for heat turns off (zone valve closes) I installed a bypass valve in the lowest zone in the house, and reduced the circulator low shut off temp to 130 F which means even though the heat isn't on my circulator will continue to run dumping this excess heat in the lowest part of house to rise through house. (the spring loaded water valve allows the heated water to flow into this zone )We do have two thermistats. And even though the lowest one is not calling for heat the radiators are hot when the excess is dumped into this zone. So investigate and see if your system might be similar. (multizone).
Investigate your wiring, reprogram, replace any battery backup.
Posted on Dec 19, 2007
SOURCE: loss of temperature control
Is the heater staying on all the time? Most likely cause of themostat trouble is the sensor. Try to find it and measure its resistance at different temps to verify the trouble.
Posted on Dec 31, 2007
with y plan 3 connections on programmer HW on HW off CH on HW on to cylinder stat then HW call to Orange on Mvalve to power boiler and pump HW off to grey wire on Mvalve to close hot water CH to room stat common then heating call to white on Mvalve
Posted on Aug 17, 2009
if you have a programable tstat you need to go through the settings for each day and time. usually the buttton will say prgm or program sometimes it will be set try to get into the settings menue and then you can adjust times
Posted on Sep 13, 2009
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