Help needed from a heating pro

[DripsnDropsBognor]

ever come across a system with no motorised valves, no cylinder stat, no room stat, two heating pipes and only one pump? Pump is concealed within boiler casing floor standing jobbie. Ideal Mexico...
Had no hot water due to lack of water in f&e. Now heating ground floor scalding hot, hot water coil seems to be heating up water in rads upstairs but not heating up...
Damned pump or blocked cold feed? Bit of both maybe.
System has potterton programmer with seperate sliders for HW and CH. Customer seems to think they can run one without the other but I'm not convinced as they only turn it on for 30 mins in the morning and same again in evening.
Any ideas? Got no pictures as such might be going back in the morning depending on the hot water situation

 

[king of pipes]

Old school heating and gravity hotwater will be air locked absolute pig to get out just keep venting rads and the pump . Kop

 

[snowhead]

You can have Hot Water only
or Hot Water and Heating.
You can't have Heating only.

There's a peg inside the Programmer that shoud be set to move the Hot Water slider when the Heating slider is moved to Timed / On.

The Hot water slider controls the Boiler
The Heating slider controls the pump.

 

[DripsnDropsBognor]

You can have Hot Water only
or Hot Water and Heating.
You can't have Heating only.

There's a peg inside the Programmer that shoud be set to move the Hot Water slider when the Heating slider is moved to Timed / On.

The Hot water slider controls the Boiler
The Heating slider controls the pump.

Customer did mention that they have to wiggle the CH slider to get it to stay on independently

 

[king of pipes]

The pump doesn't run for hot water only for heating probably has a Randall timer somewhere . Kop

 

[DripsnDropsBognor]

The pump doesn't run for hot water only for heating probably has a Randall timer somewhere . Kop

Can't find anything like that only ep2000 potterton programmer. No tees in cylinder pipes just elbows down to floor top and bottom. Heating coil connections hard against wall straight down.
Customer memory isn't great and don't want to be rummaging to much. Squeaks when he walks too. Will try venting pump and flushing cold feed if hot water not working again tomorrow. I'll get a pump on order just in case

 

[king of pipes]

Potteron ep 2000 will do a gravity system it will work as above the pump may well have got lazy and need swapping . Kop

 

[Chalked]

Don’t they teach gravity systems at college anymore?

 

[DripsnDropsBognor]

Don’t they teach gravity systems at college anymore?

Not in great detail, and chap I was training with didn't get an awful lot of gravity fault finding work. Certainly haven't come across many systems without any controls

 

[SJB060685]

A typical old school gravity system as these guys have said.
If the pump was goosed I'd expect the upstairs rads to be hot and not the downstairs.
Its quite possibly an air lock.

 

[EvilDrPorkChop]

Sounds airlocked as others have said. Luckily had quite a bit of experience with gravity as we have had a few customers with gravity systems over the years.

 

[DripsnDropsBognor]

Thanks for the help guys! Seems like I was worried over nothing just air in system. Customer hasn't called to report anything not working so could be in the clear ( at least till the cold weather hits)