Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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When i turn heating or hot water on fuse board trips

I have an honeywell control panel for my baxi boiler. when i turn on the heating or hot water within 15seconds the fuse in my main fuse board trips.

could this be the boiler, control panel or any thing to do with the pump?

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  • Anonymous Mar 17, 2014

    wocester 12 14 oil heatslave keeps tripping main trip when i turn on hot water stat

  • Anonymous Mar 25, 2014

    How do I open the remoter to change the batteries it's for my baxi boiler an controls my heating

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It was a faulty heating pump. replaced, all ok now.

Posted on Jan 05, 2009

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Posted on Jan 02, 2017

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My boiler dosent come on i have no hot water but when i turn the heating on boiler works but still no hot water what should i do


Hot water is gravity fed through your pipes. When you turn the faucet on the water will flow through the pipes. If your hot water heater is natural gas driven relight the pilot. Same if oil fueled. If electrical, check fuse to see if it has blown or the circuit breaker has tripped. If either has tripped, replace it and if it blows again the heater has a serious failure, you might need to buy a new one. If pilot won't light on gas unit, try relighting after 5 minutes, could be a bad thermocouple.

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My Baxi Combi 80e boiler turns the heating on randomly. With the wall thermostat turned down and even with the boil switched to hot water only the heating still fires up when unwanted.


If the thermostat wire run passes anywhere through, beside or inside any metal surfaces and the wires touch any of the metal its the same as if you turn the stat to on. I've seen this a few times. Easiet way to detect it, if its inside the house is at night in the dark. Look around when its doing this you may see the small spark when it goes on. Otherwise you will need to inspect the entire run from the stat to the untis, etc.

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Hi, I have a baxi solo boiler WM60/4RS and a Landis & Gyr RWB252 timer but my Honeywell T6160 thermostat has nether been connected, can anybody shed light on the wiring connections please.


The color code for thermostat wiring is as follows.
The "R" terminal is power into the stat from the boiler control transformer. Normally 24 volts. The "Y" terminal is for cooling. Normally left blank for a boiler. The "W" terminal is for heat. This one used to start the heating cycle.The "G" terminal is for fan operation. Probably not used for a boiler. Check the boiler terminal board for these functions and write down the wire color on each one. Match the boiler colors to the right function on the stat. If you need more than this, let me know.

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I am wanting to wire a Baxi 105E boiler to a Danfoss 102 mechanical timer. The boiler has 5 wires = red, blue, earth, black and yellow. The Timer has six terminals = 1 DHW, 2 HTG, 3 COM, I (earth), 5...


1) Contact baxi:
http://www.baxi.co.uk/contact.htm

2) Which boiler wires? I don't know. Page 24 manual.
Manual says to disconnect link between terminals 1 and 2, and instert timer in-line.
http://www.acwilgar.co.uk/Boiler-Manual-PDF/Baxi/Combi%20instant%2080E%20&%20105E.pdf

2) I can tell you about the timer wiring.
Timer is 230Volts
Not sure if you have British Hot-Neutral 230Volt, or Hot-Hot 230Volt.
Wiring is same 2 wires, but words to describe are different.
Let's say you have Hot-Neutral 230V
Connect Hot to L6
Connect Neutral to N5
This will power the timer so it runs and keeps time.
You can get Hot-Neutral wires from Hot-Neutral that arrive to power the boiler.

Now the timer terminals are separate.
E terminal is Earth or ground.
The Common is Hot wire.
The timer then turns on-off and switches back and forth between DHW and HTG.
HTG is heating
DHW is defrost.
Timer has 2 sets contacts.

When timer activates first set of contacts, then DHW defrost terminal receives power from Hot wire on Com terminal. At this time, all power is cut to HTG heating terminal.

When the defrost cycle ends, then the heating circuit receives power, and then the timer has programming that opens and closes a second set of contacts going to HTG heating terminal.

Which wires from boiler connect to each terminal, I am not sure.

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this will be your diaphram inside your divertor valve.
the one that looks like a spaceship.
it will e split.

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