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Rob, Home Appliance Technician
Category: Appliance
Satisfied Customers: 420
Experience:  20 yrs. experience with a major worldwide manufacturer.
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I have a Honeywell cm900 attached to a Drayton lp522.

Customer Question

I have a Honeywell cm900 attached to a Drayton lp522. Unfortunately the grey wire came out when we were moving it when tiling and we can't see where to put it. Can anyone advise?
Submitted: 1 year ago.
Category: Appliance
Expert:  JamesI replied 1 year ago.

There are many ways to wire the CM900 to IP522, can you advise if the wire is between the two, and which end has become disconnected?

Customer: replied 1 year ago.
It is the wire between the two and it is the end going into the lp522 that is disconnected
Expert:  JamesI replied 1 year ago.

Ok depending on the wiring standard used it may be worth checking which colours where used for the terminals from CM900, the manual for the CM900 can be found here, which shows on the right hand side of page 4 what each terminal is used for (in essence there should be 3 terminals A, B and C).

Customer: replied 1 year ago.
On the cm900 we have a and b. A is grey and b is black. It is the grey cable that is disconnected. C is empty
Expert:  JamesI replied 1 year ago.

Ok next we need to look at the IP522, the manual for the terminal layout can be found here.

Give me a minute to get my head round the current setup on your CM900

Expert:  JamesI replied 1 year ago.

From what I can make out one of the two cables (black or grey) should be going to terminal 2 the other terminal 4, can you advise if this matches up to what you can see at your end?

Customer: replied 1 year ago.
The black goes to terminal four. From what I could gather from the diagrams I had come to the conclusion that it had come out of terminal 2, however the heating won't kick in
Customer: replied 1 year ago.
The cm900 gets a green light on it so is receiving from the wireless thermostat, although not instructing the boiler to go on
Customer: replied 1 year ago.
Hi, just checking that we haven't lost connection?
Customer: replied 1 year ago.
Are you still there?
Expert:  JamesI replied 1 year ago.

Hi sorry, it appears I didnt get your messages until this morning.

Right, can you tell me what the other wires going to the boiler for hot water are doing (which terminals are they connected to on the IP522?