Question about Water Heaters
I have 3 wires coming into my old Landis and Gyr room thermostat. Red to port6 Blue to port 4 and yellow to port 3. I have bought a new Honneywell Digital thermostat from screwfix which advised it was for a 3 wire connection. Only 2 wires can be connnected on the new thermostat with out breaking off a seal for the third wire. Can I connect the new thermostat with two wires and which ones - or do I need to connect the 3 wires and to where?
SOURCE: Honeywell wall thermostat
I'm Harvey the Plumber,
First, Your question is if your thermostat is wired correctly!
Assuming that it is correct, a common problem that most people and plumbers overlook is correctly setting the heat anticipater on the thermostat.
Assuming that you have a gas central heating system, then you must simply look on the gas valve for the amp rating.
For instance,if the gas valve printing says .4 amps then set the heat anticipater for .4
It's common for the unit to turn on and off erratically (short cycling) when this setting is not correct.
If all you are worryied about is the wiring, you must look at the wireing diagram that came with the thermostat.
Further diagnoses would requie detailed information about your central heating system.
Or the alternative would be to have a hands on tech help you out.
Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Posted on Sep 09, 2008
9 TIMES OUT OF 10 THE COLORS ARE THE SAME. MATCH THEM UP. FIRST LABEL THE WIRES ON THE ORIGINAL STAT, AND PUT THEM IN THE CORRESPONDING PLACE ON NEW ONE.
Posted on Oct 27, 2008
you should have a plug for 115V, There should be two wires coming out of the bottom of the unit. These are for the humidistat. did you purchase this new??
Posted on Nov 10, 2008
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