Radiators don't receive hot water
I have a Daikin Altherma monobloc 9Kw. Turned space heating on for the first time a few days ago. Most of my radiators don't get hot water at all, their flow pipe is cold. The flow pipe of the two radiators in the loop is warmish. I bled all radiators, there was a tiny bit of air in one, and re-pressurised to 1.5 bar.
In the pump's user interface, the leaving water temp is 45 and the flow rate is 43.2 although it sometimes jumps. I left the heating on for over 24 hours (cheated the thermostat to make it work continuously). Still the rad pipes are cold.
Suggestions anyone?
so there is hot water in the system being generated by the ASHP and its going somewhere, but not to your radiators.. this is a normal plumbing and heating problem, doesn't sound ASHP specific. Either work out where the hot water from the ASHP does go (follow the pipes , draw a diagram) and report back... or call in a heating engineer? as I said it doesn't sounds like an ASHP specific problem so any local PHE person will do.
My octopus signup link https://share.octopus.energy/ebony-deer-230
210m2 house, Samsung 16kw Gen6 ASHP Self installed: Single circulation loop , PWM modulating pump.
My public ASHP stats: https://heatpumpmonitor.org/system/view?id=45
11.9kWp of PV
41kWh of Battery storage (3x Powerwall 2)
2x BEVs
Posted by: @soboI have a Daikin Altherma monobloc 9Kw. Turned space heating on for the first time a few days ago. Most of my radiators don't get hot water at all, their flow pipe is cold. The flow pipe of the two radiators in the loop is warmish. I bled all radiators, there was a tiny bit of air in one, and re-pressurised to 1.5 bar.
In the pump's user interface, the leaving water temp is 45 and the flow rate is 43.2 although it sometimes jumps. I left the heating on for over 24 hours (cheated the thermostat to make it work continuously). Still the rad pipes are cold.
Suggestions anyone?
If you have a 3-way valve or two 2-way valves in your system then check that they are operating correctly.
@derek-m thanks, not sure which valves to look at and how are they supposed to operate?
Two of my radiators do work (I guess they’re the first in the loop) but their flow pipe is below tepid. My leaving water temp is 45. is this supposed to be the temp of the water flowing into the rads?
Posted by: @sobo@derek-m thanks, not sure which valves to look at and how are they supposed to operate?
Two of my radiators do work (I guess they’re the first in the loop) but their flow pipe is below tepid. My leaving water temp is 45. is this supposed to be the temp of the water flowing into the rads?
If you are not getting sufficient warm water to your radiators, then the flow is being reduced by a valve, your pump is not working correctly, your filter is blocked, or the flow is being diverted.
Check that the water pump is running.
Check that any filters are not blocked.
Look for an automatic bypass valve and check its setting. Just Google 'automatic bypass valve' if you are not certain what to look for.
Check the operation of any electrically operated valves. Just Google 'electrically operated valves' if you are certain what to look for.
Post photo's if you require help.
- 22 Forums
- 2,075 Topics
- 45.5 K Posts
- 84 Online
- 3,355 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: 5 Star Service from Havenwise
@sheriff-fatman Exactly this is why a lot of our users ...
By HCas , 47 minutes ago
-
RE: Solar Thermal DHW and ASHP
I'm beginning to think solar thermal is something that ...
By Alex_N , 3 hours ago
-
Feasible solutions to expand existing Sunsynk battery capacity
I have a 6.3kWp solar array with a 5kW Sunsynk inverter...
By Sheriff Fatman , 3 hours ago
-
RE: Commencing on an ASHP Installation Process
I received the BUS Grant permission email yesterday eve...
By Sheriff Fatman , 4 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
510kWh of solar PV from my 4kW Hyundai panels and SMA S...
By JulianC , 2 days ago
-
RE: Is my Samsung heat pump working too well?
Thats in itself is interesting. I have a Vaillant heat...
By JamesPa , 2 days ago
-
RE: Jokes and fun posts about heat pumps and renewables
@transparent Not a swell season then ☹️
By Toodles , 2 days ago
-
RE: Air Changes per Hour - ACH and the MCS requirement
update - my old installer insisted on a heat loss of 11...
By MatWin , 3 days ago
-
I agree it's not very helpful. Generally, the max heat ...
By Old_Scientist , 3 days ago
-
RE: Why Your MCS-Certified Installer Might Not Be As Competent As You Think
Hive and most other smart thermostats don't play well w...
By JamesPa , 4 days ago
-
RE: Enabling WiFi: Samsung ASHP on Smart Things App
Thanks for the input. I've been running various experim...
By Grahamh-uk , 4 days ago
-
RE: Radiators downstairs are cooler at the bottom after ASHP install
@melonbuffet Hi, this sounds great is you are getting 5...
By ASHP-BOBBA , 4 days ago
-
RE: Ripped Off: How UK Homeowners Are Paying Gas Prices for Wind Energy
I believe there's another reason that network upgrades ...
By Transparent , 5 days ago
-
RE: What’s the modern take on advised types of insulation?
@jeff I am sorry @jeff if I have misunderstood what you...
By Toodles , 5 days ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
@editor Cobbler’s Mantra that!
By Toodles , 5 days ago
-
RE: Renewables & Heat Pumps in the News
Australia Blue, the first wind farm in Western Victoria...
By Morgan , 6 days ago
-
RE: Flow rate discrepancy between ASHP and manifold
That's useful thanks, I hadn't seen that table before. ...
By AshRolls , 7 days ago
-
In principle I agree, @johnmo, but with provisos. The...
By Majordennisbloodnok , 7 days ago
-
RE: Heat pump installation and BUS Grant timings
@jamespa Thats how I understood it too. 🙂
By ASHP-BOBBA , 1 week ago