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Many times the factory wiring on the boiler is set up to maintain boiler temperature with a built-in aqua-stat. The thermostat then controls the circulator pump to transfer heat from that loop to the structure. So, if this is the case, your programmable stat may just be controlling the circulator. There are many, many control AND piping configurations to boilers. Some very different than others.
Let's see what we can do to trouble-shoot this boiler--
First of all-- Are we talking about a Hot Water 'Boiler'-- In other words does this boiler heat water that circulates thru the house, to keep you warm?
Next-- What is your fuel?
Have you Shut the system down, to reset it?-- What happens when it comes back on again?-- Clicking sounds-- pumps trying to start-- solenoids trying to open, etc.-- Tell us what you observe-- so we can help you trouble shoot this problem.
Here you go, this is pretty much identical to the Altech unit you're describing (Salus RT500RF Manual (SALR503) 531ESALR50310A95), I have the Altech ALTHC014 too, I have checked them against each other. Hope this helps, this is probably why you can't find the Altech manual, as the Salus one is the same and they haven't bothered rebranding this manual to Altech.
It appears that the boiler is going into hard lock out. This is caused by successive ignition failures for some reason. After 3 attempts to light, a high limit trip, low water flow, etc, the unit will lock out and will require a power reset in order to reset the ignition control. You should have the cause investigated to ensure safe operation.
Do you have an inducer on this unit? If you do, it could be the pressure switch not opening or closing properly. Also, check for any limit switches that might have tripped that you need to reset. Some limits are automatic reset and some are manual. Also, check for a reset switch on the unit that is used when the power gets cut un expectantly. You can do a little research on the unit also using the model number and brand of unit on-line to find a user manual that might have some trouble shooting guidelines.
the stat works using a bi metalic strip so that click you here is making a contact and telling the boiler to call for heating so if you getting no click you need a new room stat. Replace with same model and note the wiring most stats only use 2/3 wires depending on system
Prior to writing the above fault I had asked the owner to turn the boiler temp controller , for the heating side, down just a fraction . I was phoned this morning to tell me that the boiler had stayed on allnight with no fault light . After consulting with the plumber who fitted the system it appears that there might not be a room stat ,